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ple’s iPhone. See the section “Control a PC Remotely” on page 488 for

details.

Subsystem for Unix-based Applications

Also known as Interix, this is basically a Unix and POSIX layer that allows

you to run Unix software on your Windows 7 PC. Don’t have the Sub-

system for Unix-based Applications? Cygwin does more or less the same

thing, and is free for all versions of Windows.

Virtual Hard Disk Booting

If you use the Windows Backup tool to create an image of your hard disk

as described in Chapter 6, you’ll end up with a VHD (Virtual Hard Disk)

file. VHD files are also used by Windows Virtual PC (see “Virtualize

Whirled Peas” on page 30). In the Ultimate and Enterprise editions of

Windows 7, you can boot your PC off a VHD file without using a virtual

environment, effectively offering another means of multiple booting. If

you have a lesser edition of Windows, you can do the same thing with

multiple hard disk partitions, as described in “Set Up a Dual-Boot Sys-

tem” on page 26. See Chapter 6 for more on virtual hard disks.

Windows XP Mode

See the sidebar “Windows XP Mode” on page 33 for details on this

feature, and how you can get basically the same thing in Home Premium.

64-Bit Windows

More bits gets you access to more memory, and more memory means a faster,

smoother-running OS. The processor inside your PC communicates with your

system memory (RAM) with numeric addressing. Thus the maximum amount

of memory a 32-bit processor can address is 2

bytes, or 4 gigabytes. Newer

64-bit processors—not to mention the 64-bit operating systems that run on

them—can address up to 2

bytes of memory, or 17,179,869,184 gigabytes

(16 exabytes) of RAM. (17 million gigabytes may sound like a lot of space now,

but it won’t be long before you’ll be taking baby pictures with a 9-exapixel

digital camera.)

In reality, 32-bit Windows can only make use of about 3 GB

of RAM before hitting a wall; see Chapter 5 for details.

Windows NT, released in 1993, was Microsoft’s first fully 32-bit operating

system. But it took eight years before the platform, which had since evolved

into Windows 2000 and then XP, became mainstream. (For those keeping

6 | Chapter 1: Get Started with Windows 7

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