winnt.exe and winnt32.exe
Winnt.exe A+ Guide Sixth Edition: page 526
Real Mode and Protected Mode
user mode and kernel mode
Windows desktop and The Recovery Console
The XP setup program is a 32 bit program, while the 2000 setup program is a 16 bit program.
There are two options to choose from during the Windows 7 installation process: Boot to the Install CD and choose Custom for a clean installation.Upgrade. This option replaces your current version of Windows with Windows 7, and keeps your files, settings, and programs in place on your computer.Custom. This option replaces your current version of Windows with Windows 7, but doesn't preserve your files, settings, and programs. It's sometimes referred to as a clean installation for that reason.
Limiting access to hardware mainly to the HAL increases OS integrity because more control is possible.
those are operating systems, not programs. you could have both installed and have a dual boot set up to run one or the other. or you could install a program such as Virtual PC so that you can run one in virtual memory while the other is loaded.
Cygwin is a Unix like environment that runs on top of windows, in particular it allows us to use the GNU Compiler Collection (GCC) to compile our programs. To install GCC on Windows XP, visit the link in Related Links section. The link shows a good and step by step tutorial. (The MinGW environment is an alternative way to run gcc on Windows. Unlike Cygwin, it does not provide a POSIX environment.)
Limiting access to hardware mainly to the HAL increases OS integrity because more control is possible.
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Yes, you can do it, but firstly you have to install XP and Windows 7 must be installed afterwards. Moreover, you must create two partitions to install them.