what is KdE on cygwin

Hi,

first of all i would admit i am not a regular user of linux therefore
not to familiar with the terms. i know some unix comands to help me do
the things i need to do to use Unix/linux. i installed Cygwin on my XP
system to emulate solaris system so that i can run unix software from
my windows machine.

my questions are as follows
Q.1 other than emulating a remote unix system  what really a user
should ge by installing cygwin.

Q.2. Can i install unix software in windows machine if cygwin is
installed?  and run it as if the software is installed in a remote
unix machine and i am emulating it?

yours answers will be highly appreciated. thank you.

AJ