"WINE for running Windows apps inside Linux
"WINE is not just any application. Its more like an emulator or
program loader, capable of running Windows applications in Linux,
BSD, Solaris and Mac OS X. Its there so you can't make any excuses
to why you can't move to Linux. You can run any must-have
Windows-based programs, right inside your favorite distro. Though
not every program works with WINE, millions of people use it.
"andLinux, an opposite of WINE
"Want the cost-savings and freedom of Linux inside the familiar
Microsoft OS? Well with andLinux, you can seamlessly run Linux
right in Windows. You get the best of both world's!
"After the installation, you'll find several apps already
installed and available from the system tray icon. You can use
apt-get or Synaptic to install any others. You can run the Linux
and Windows applications simultaneously. You can even copy, cut,
and paste between them.
"andLinux also includes shell extensions for Windows Explorer.
For example, Linux apps will appear in the Open With selections.
File type associations can also be assigned to Linux apps. There's
even support for Windows scripts."