XLS is a preliminary minimal version of XLISP-STAT for MSDOS. The only graphics available are plot-points and plot-lines. There is not much memory available - whatever you can get out of 640K. The file xlszip.exe is a self-extracting zip file. To extract the stuff, type xlszip -d The -d option insures that the directory structure in the zip file is preserved. After unpacking this stuff, put the executable, xls.exe, somewhere on your search path and put the lib directory somewhere convenient. Then be sure to define an environment variable XLISPLIB with the path of the directory ENDING WITH A \. So if you put the library in c:\xlisp\lib, define set XLISPPIB=c:\xlisp\lib\ Put this in your autoexec.bat or somesuch so it is available whenever you run xls. Then type xls.