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 Memory swapper
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 The integrated memory swap function allows you to `shell' out from your DOS
 program and execute another program, such as a word processor, a backup
 utility, or the DOS command prompt.

 The major difference between this function and the C language exec()
 function, the BASIC language SHELL statement or the CA-Clipper RUN command,
 is that almost all of the memory occupied by the parent program is made
 available to the child program.

 This is accomplished by saving all or part of the parent program's image to
 XMS, EMS or disk, leaving a small resident kernel, executing the child
 program, then restoring the parent program's image exactly as it was prior
 to the shell, and resuming execution of the parent program. The size of the
 kernel varies from 0-11 Kb.