Cannot open display

[Gert Bartholomeeusen]

Dear Cygwin People,
	I have trouble getting the xfree86 to work with Cygwin.  I followed the 
installation instructions through 
( http://xfree86.cygwin.com/docs/howto/cygwin-xfree-ug.html )  When I come 
to the 'startxwin.bat' I get 'Can't open display'.  (Clicking the batch 
file made a couple DOS-boxes flash up and off)
	I tried start XWin first and afterwards an Xterm
$ XWin -screen 0 1024x768x16 -whitepixel 255 -blackpixel 0 -engine -4
<Screen Output>
$ xterm Xt error: Can't open display:	

	Changing SET DISPLAY=127.0.0.1:0.0 to my ip-address did not help.
	What can I test next?
			Thanks,
				Gert