This version of DDLAB was compiled for Cygwin/X, a Linux environment running in Windows. Your Cygwin/X must have the default packages, and also xorg-x11-base, xorg-x11-devel, xorg-x11-fnts. To run DDLab: start Cygwin and enter "startx" to get an xterm window, then from the directory with the DDLab files, enter the name of the executable preceded by ./ and followed by & for example ./ddlabm08_cygwin32 & or ./ddlabx09_cygwin32 & alternatively, first change directory to "ddfiles" then enter the name of the executable preceded by ../ and followed by & DDlab should run just like the Linux or Mac versions, though much slower. To compile DDLab: Click the Cygwin icon. Enter "startx", the Cygwin xterm window will open. In the xterm, change to the directory with the DDLab source code and Makefile.. Enter: "make -f Makefile_Cygwin" (or the name of the Makefile) If the compile is successful, ddlabm08.exe (or the file name set in the Makefile) is created. Run as described above.