Cygwin/X

Cygwin/X is a port of the X Window System to Cygwin; Cygwin provides a UNIX-like API on the Win32 platform.
 * Cygwin/X User's Guide

startup settings
D:\Devapps\cygwin\bin\run.exe /usr/bin/bash.exe -l -c "/usr/bin/startxwin.exe -- -nolock -clipboard -trayicon -multiwindow"

On the unix box
export DISPLAY=machine:0.0

Fatal server error: Can't read lock file /tmp/.X0-lock
A1:

/tmp resides on a FAT filesystem

Start the server with -nolock (e.g. if you use startxwin.bat or startxwin.sh to start the server, add -nolock to the XWin line in that script; if you use startxwin, xinit or startx, run it as startxwin -- -nolock, xinit -- -nolock or startx -- -nolock)

You should really consider updating the filesystem to NTFS using Microsoft's convert.exe tool.


 * taken from http://x.cygwin.com/docs/faq/cygwin-x-faq.html#q-cant-read-lock-file