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  Name:     isems() - check if expanded memory manager is installed
  Usage:    <logical> = isems()
  Params:   none
  Returns:  logical .T. if the expanded memory manager is
            installed, .F. if not

 ---------------------------------- Example ---------------------------------

                 if (! isems())
                      ? "This machine has no expanded memory"
                 else
                      ? "Expanded memory: "+str(expmem())
                 endif