This emulator is created at AT&T.
This emulator lets you execute almost all UNIX commands at prompt.
This emulator supports shell scripts also.
That is you can practice all UNIX(Linux) commands on your machine.
No need to install Linux on your machine.
This software is written in C and available commercially also.
To download copy this url in address bar of your brower
http://www.research.att.com/tmp/reuse/pkgBAAa1M30u/uwin_base.win32.i386.exe
Download Size:-About 8 Mb app..