This version of DDLAB was compiled in Windows 7 for Cygwin/X, a Linux environment running in Windows. and includes Null Boundary Conditions ddlabx11_cygwin32.tar.gz will unpack to give ddlabx11_cygwin32.exe and this readme. Your Cygwin/X must have the default packages, and also xorg-x11-base, xorg-x11-devel, xorg-x11-fnts. To run DDLab: click on the Cygwin icon and enter "startx" to get a terminal, then from the directory with the DDLab files, enter the name of the executable preceded by ./ and followed by & ./ddlabx11_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", for the Cygwin terminal. Change to the directory with the DDLab source code and Makefile. Enter: "make -f Makefile_Cygwin_x11" (or the name of the Makefile) If the compile is successful, ddlabx11.exe (or the file name set in the Makefile) is created. Run as described above.