While the Windows and Mac user interfaces are broadly similar, they do have subtle variations in day-to-day use that require some re-education for switchers. And because there are so many fewer Mac users than Windows users, help from friends and co-workers can be harder to obtain than it is for people switching the other way, to Windows from Mac.

So, here’s a quick tip sheet explaining a few of the most common differences in the daily use of Windows XP (MSFT), from which most people would be switching, and Apple’s (AAPL) Mac OS X Leopard, which switchers would be adopting.

This column isn’t an argument for making the switch to a Mac, merely an attempt to help those who have done so, or who are considering doing so. Of course, all Macs currently sold can run Windows and Windows programs concurrently with the Mac operating system. But this guide is for folks who intend to use their Macs primarily with Leopard, not Windows.

Menu Bars: In Windows, each program typically has its own menu bar. On the Mac, there’s a single menu bar at the top of the screen that changes, depending on which program you are actively using.

Task Bar: The equivalent of the Windows XP Task Bar on the Mac is the Dock. Unlike the Task Bar, which primarily holds icons representing open windows, the Mac Dock primarily holds icons of programs you use most often. To place a program onto the Dock, you just drag its icon there. To remove it, you just drag its icon off the Dock and it disappears in a puff of animated smoke.

Start Menu: There is no Start Menu on a Mac. Its functions are divided between the Dock and the Apple menu at the upper left of the Mac screen.

Control Panel: The Mac equivalent of the Windows Control Panel is called System Preferences, and it can be launched from either the Dock or the Apple menu.

Keyboard shortcuts: Common Windows keyboard commands, such as Ctrl-S for Save, Ctrl-P for Print, and many others, are also available on the Mac. However, instead of using the Control key, they use the Mac’s Command key, which bears either a cloverlike symbol or an Apple logo. So, on the Mac, for instance, Command-S is for Save.

Quitting programs: In Windows, you can quit a program by clicking on the red “X” in a square at the upper right corner of the window you’re using. But on the Mac, if you click on the equivalent button — a red “X” in a circle in the upper left corner — you are merely closing the window, not quitting the program. To quit the program, you must either select Quit from the leftmost menu or press the Command and “Q” keys together.

Maximizing windows: When you click on the blue maximize button in Windows XP, the window you are viewing occupies the whole screen. In Leopard, the equivalent button — a green circle at the upper left — increases a small window’s size to a footprint deemed optimal for its contents, which isn’t always the whole screen.

Switching programs: One common way to switch among running programs in Windows XP is to press Alt and Tab together. This displays icons of each running program and allows you to switch among them. On a Mac, the same trick can be performed by pressing the Command and Tab keys together. The Mac also has a terrific feature called Expose, which shows every open window at once, in miniature form, so you can navigate among them. You can trigger Expose in a number of ways, but the most common is to hit either the F9 key or the dedicated Expose key, depending on your Mac model.

Right-clicking: Contrary to common belief, the Mac has a right-click menu function, just like Windows. Most desktop Macs now come with a mouse that allows right-clicking, and you can use almost any two-button USB mouse with any modern Mac. If you are using a Mac laptop, which has only one button under the track pad, you can simulate a right-click by either holding down the Control key when you click, or by placing two fingers on the track pad while clicking. The latter technique, which I favor, must first be turned on in System Preferences.

Screen: Your desktop picture and screen saver on a Mac are set via a System Preference called Desktop & Screen Saver. Screen resolution is set in the Displays System Preference. In Windows XP, all of these things are included in the Display control panel.

For more information, Apple offers two Web sites. One is called Mac 101, and is at apple.com/support/mac101. The other is called Switch 101, and is at apple.com/support/switch101.

• Find all of Walt Mossberg’s columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com. Email him at mossberg@wsj.com.

About 18 months ago, the giant PC maker brought out an unusual desktop computer called the TouchSmart, a bulky model meant for kitchen counters. It was intended as a walk-up home kiosk, with large icons you could activate by merely touching them to check the weather or to consult your calendar.

This TouchSmart was praised for its originality, but it wasn’t as practical as promised, and wasn’t a big hit. Still, H-P is persevering with the concept. It has refined the hardware and the touch-controlled software, and has come up with a new line set to go on sale by mid-July.

This new TouchSmart, which comes in two models priced at $1,299 and $1,499, is a relatively slim, one-piece desktop with a large 22-inch screen. It resembles the Apple iMac or the Dell XPS One and, like the latter, runs Microsoft’s Windows Vista. It has a wireless keyboard and mouse, and can be used as a normal Vista computer.

But, like the first TouchSmart, this new model comes with H-P’s touch-controlled user interface and special programs designed to be manipulated with your fingers. For this model, H-P is de-emphasizing the idea that the machine is meant for the kitchen, but it is forging ahead strongly with the notion that touch control is the wave of the future.

After testing the new TouchSmart PC for a few days, my verdict is mixed. The TouchSmart software is indeed improved. It’s attractive, more versatile and more practical — and fun to use. The hardware is handsome and well-equipped. And H-P deserves credit for continuing to build software expertise in a world where makers of computers and cellphones must become as expert at software as they are at hardware. But the latest effort has some problems.

The TouchSmart interface is inviting. There’s a top row with huge icons, called tiles, displaying your favorite programs, and a bottom row of smaller tiles for other programs. You can scroll each row with a finger and decide which programs go in which row. You can even include in either row not only TouchSmart programs, but the regular Windows programs or Web sites that you like. When you tap on a tile that isn’t for a special TouchSmart program, the computer pops you into the regular Windows interface. To return to the TouchSmart interface, you just tap a home button below the screen.

Hewlett-Packard’s TouchSmart

The TouchSmart software includes a calendar, a weather widget, a clock, music and video players, a program for composing short notes, and even a basic Web browser. All worked OK in my tests, but they’re simple and limited.

The computer itself is fairly powerful. Both models have dual-core processors, large hard disks, and a whopping 4 gigabytes of memory. And both run the special 64-bit version of Vista, which allows more memory usage and can be much faster than regular Vista, but only if you buy special 64-bit software programs. This machine is loaded with every conceivable port and connector, mostly hidden from view, and the high-end model even has a TV tuner.

But this is still a Vista computer, with all of the disadvantages that entails, especially a sluggish start-up and an annoying barrage of pop-up warnings. And the new TouchSmart is preloaded with craplets, those irritating trial programs and come-ons that you didn’t order.

There’s a built-in Webcam that works in low light, but it’s almost impossible to tilt the computer forward to get the best shot. Plus, the TouchSmart software interface is very basic and is ragged around the edges. It isn’t a multitouch interface — like the ones on the Apple iPhone and in the next version of Windows, code-named Windows 7, that recognize a variety of gestures and perform different tasks when multiple fingers are used rather than just one. For example, you can’t rotate a photo on the TouchSmart by grabbing it with your fingers, or move back and forth through Web pages by swiping the browser with your fingers.

The TouchSmart software is just a thin shell plopped on top of Vista, and it crashed on me four times during the course of a few days of testing. Also, the limitations of the TouchSmart applications can be frustrating. The photo application wouldn’t let me create albums. The music application didn’t display artist names for some of my MP3 files, and the calendar application can’t display an onscreen reminder of an event if you’re working in the main Vista interface.

If you’re intrigued by the idea of a quick and simple interface on a handsome one-piece Vista machine, the TouchSmart might make sense. But it doesn’t deliver on the full promise of touch computing.

• Find all of Walt Mossberg’s columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com. Email him at mossberg@wsj.com.

This interface is generally called “multitouch,” and it involves using one or more fingers on a screen or touchpad to perform special gestures that manipulate lists or objects on a screen — without moving a mouse, pressing buttons, turning scroll wheels or striking keys.

The best-known example of the interface is on Apple’s iPhone and iPod Touch devices. It allows you, for example, to rapidly flip through photos, lists of emails or song titles by merely “flicking” a fingertip on its screen, or to resize a photo by “pinching” the image with two fingers. And, this month, Apple moved some of these multitouch features onto a laptop, its new MacBook Air, where fingertip actions are performed on an oversized touchpad rather than on a screen.

Apple didn’t invent the multitouch concept. Academic and commercial researchers, and small, obscure companies, have been working on it for years. Apple is adapting the concept, adding its own ideas and popularizing it — just as it did in the 1980s with the mouse and the graphical user interface, which had also been invented elsewhere.

Rival companies are scrambling to add multitouch features to laptops and other digital gadgets. Synaptics, a leading supplier of touchpads for laptop makers who compete with Apple, has announced that shortly it will incorporate several multitouch features into its touchpads. Microsoft is producing a coffee-table-size computer called the Surface, meant for hotels, casinos and retail stores, that uses multitouch finger gestures to move around digital objects such as photos, play games and browse through product options. Hewlett-Packard developed a prototype of a similar multitouch coffee-table computer for home use.

Rotating a photo on Apple’s MacBook Air

And, in the back rooms of this month’s Consumer Electronics Show in Las Vegas, various cellphone makers, seeking to emulate the iPhone, were showing off their own unannounced efforts at multitouch. One prominent cellphone maker, Taiwan-based HTC, has already built a phone, called the Touch, which slaps a rudimentary multitouch interface on Microsoft’s Windows Mobile operating system.

The basic touch screen, of course, is an old and familiar thing. People use them every day to get money from ATMs or to check into flights at airport kiosks. Microsoft’s Tablet computers and Palm’s Treo cellphones, among others, use touch screens that employ styluses or fingers to move cursors, select icons and other items, and even to write on the screen.

But multitouch interfaces are potentially much more versatile. They allow you to use your fingers to manipulate virtual objects on a screen as if they were real, sort of the way Tom Cruise’s character did in the 2002 Steven Spielberg science-fiction film, “Minority Report.” For example, Microsoft’s Surface allows users to rearrange groups of digital photos by just dragging them around on the table top as if they were actual paper prints.

Unlike the touch screens on, say, ATMs, multitouch devices are able to distinguish between the press of a single finger and the press of multiple fingers, and to interpret the motions or gestures you make. They take different actions depending on how many fingers they detect and which gestures a user performs.

On Apple’s MacBook Air, the touchpad still allows you to use one finger to move the cursor and click like a mouse can. But, optionally, it can do much more using multitouch gestures.

You can rotate photos by just touching two fingers to the touchpad and moving the images on the screen as you wish. You can quickly move back and forth through a series of Web pages or photos by “swiping,” or placing three fingers on the touchpad and moving them rapidly sideways. And you can shrink or expand a photo, or zoom in and out on a Web page, by pinching the image.

All recent Mac laptops, not just the new Air, have the optional ability to scroll through a screen without using any button or special zone on the touchpad. You just place two fingers, instead of one, anywhere on the touchpad and drag them across its surface.

In addition to pinching, the new Synaptics touchpads have a feature called “ChiralMotion,” which achieves rapid scrolling by moving two fingers in a circle anywhere on the touchpad. Another Synaptics feature, called Momentum, lets you emulate a trackball by flicking a single finger across the touchpad. This gesture can move an object on screen, like a virtual bowling ball in a game, with the illusion of inertia.

It’s too early to know if the new multitouch approach will ever be as big as the mouse-driven graphical user interface. But it’s already evident that it offers real advantages on devices where a mouse isn’t possible or convenient to use, or the decades-old interface of menus and folders is too cumbersome.

Email me at mossberg@wsj.com. Find all my columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com.

Meanwhile, the rest of the computing word had long discovered that a scroll wheel and a second button — the right-click button — have lots of utility and are very easy to master. Apple’s archrival Microsoft has been making two-button models since its first mouse hit the marketplace a few months after Apple’s in 1983, and models with a scroll wheel since 1996. The scroll wheels make it easy to wade through long screen displays, and the right button produces a drop-down menu with actions appropriate to whatever is on the screen.

On Tuesday, Apple finally gave in — sort of. The company released an optional, add-on mouse called Mighty Mouse that allows right-clicking and scrolling. But in a stubborn homage to the old dogma, Apple designed the Mighty Mouse so it looks like, and can work like, a one-button mouse. Those clashing design goals make the Mighty Mouse harder to use than competing mice.

Meanwhile, Microsoft has also brought out a new mouse in the past few weeks, the Wireless Optical Mouse 5000. It isn’t as slick-looking as Apple’s new entry, but it’s better, in my view. The Microsoft mouse has an innovation: It allows you to instantly magnify any portion of your screen without zooming into the whole display. That’s a great help to people doing detail work, not to mention to the increasing number of baby boomers with declining vision.

Both of these new mice are primarily designed to work with each company’s own computing platform. Each will also work on the other’s platform, although some special features, like the Microsoft magnifier, don’t carry over. Apple’s Mighty Mouse costs $49. Currently, the new Microsoft mouse is only available bundled with a keyboard in a set that tops $100. It will be sold separately for $54.95 starting next month.

Microsoft’s new model is cordless, like most modern, premium mice. Apple’s Mighty Mouse is tethered to the computer with a cord, like most low-end models.

As with all of Apple’s mice in recent years, the Mighty Mouse has no visible buttons. The entire top surface of the shiny white mouse operates as a giant button. In single-button mice, this works fine and is kind of cool. But it makes it hard to do a right-click. So Apple built touch sensors into the Mighty Mouse that detect whether you are pressing its left or right side.

Macintosh fan sites on the Web are already hailing this as another of Apple’s brilliant design coups. It’s not. In my tests, I found that the design makes right-clicking slower and clumsier than on a typical Microsoft or Logitech mouse with real buttons. (These non-Apple mice work perfectly on Macs.)

In separate tests with separate Mighty Mouse units on separate computers, my assistant Katie Boehret and I found that right-clicking with the Mighty Mouse was unpredictable. Sometimes it worked, sometimes it didn’t. We needed to press the right side repeatedly to get a single right click, slowing us down and annoying us, well, mightily.

If you have Apple’s latest operating system, you can set up the Mighty Mouse so both sides act like a left mouse button, in effect turning it into a one-button mouse. Apple ships it that way so as not to shock one-button mouse lovers who have been living in a cave.

The scrolling function on the Apple mouse is also somewhat compromised in the name of design. Instead of the tried and tested scroll wheel, Apple embedded a tiny “scroll ball” in the top of the Mighty Mouse. It allows you to scroll vertically, horizontally and even diagonally. It looks cool, but I found it inferior to a scroll wheel and could never get it to work diagonally.

Another Mighty Mouse feature works much better: If you squeeze the sides of the mouse, it launches the Mac’s excellent Expose feature, which shows every open window in miniature on one screen. This works only on Macs with the latest operating system.

The right-click button and the scroll wheel on the wireless Microsoft mouse worked quickly and surely every time, even on a Macintosh. But the key feature of the Wireless Optical Mouse 5000 is the magnifier button. You just click this little button on the mouse’s left side, and instantly a rectangular area around the cursor opens to magnify that portion of the screen below. The rest of the screen remains normal.

You can expand or contract the magnifier window, or increase or decrease magnification. To dismiss the magnifier window, you just click the button again. This feature is especially great because instead of being just a temporary viewer, the magnifier window is an active area of the screen. You can work in it just as if it were in normal view — clicking, typing and selecting.

So, stop the presses: Microsoft has beaten Apple on hardware design, at least in this one case.

Write to Walter S. Mossberg at walt.mossberg@wsj.com