This version of ddlabm07 was compiled for Cygwin/X, a Linux environment running in Windows. To run DDLab, 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 "ddlabm07_Cygwin &" or "./ddlabm07_Cygwin &". or first change directory to "ddfiles" and enter "../ddlabm07_Cygwin &" It should run just like the Linux version. To compile: Click the Cygwin icon Enter "startx", the Cygwin xterm window will open. In the Cygwin xterm, change to the directory with the source code. (to find the directory it might be necessary to backtrack with "cd ..") Enter: "make -f Makefile_Cygwin" (the name of the Makefile) If the compile is successful, ddlabm07_Cygwin.exe is created. Run as described above.