cygwin as X client

[HZhou@lbl.gov]

Dear All,

Now I am on trip, the computer in my offcie is cygwin/win2000. I opened the ssh and apache server.
The computer I used now is a linux system. I sshed to
my cygwin and want to use xterm. But it gave the error
information
   xterm Xt error: Can't open display:
But I can use xterm on cygwin locally. 
I sshed with the parameter -X,
and I browsered the mail archives, I didn't find help
for me.
I only wanted to use the Xapplication and I should be
able to do so for I can use it locally. What is going
wrong?

Your kind help will be greatly appreciated.

Best regards,
Hong