numeric
The Keepmem switch specifies the amount of extended (XMS) memory or expanded (EMS) memory kept by PWB during a shell, compile, build, or other external command. Specify the value in units of kilobytes (1024 bytes).
A larger number means that shelling is faster and leaves less memory for tools that use extended or expanded memory. A smaller number means that shelling is slower and leaves more memory for tools. If the number you specify is not large enough, PWB uses no extended or expanded memory.
Keepmem:2048