SWPUSEEMS
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  Function : Enable or disable use of EMS by the swap system.

  Syntax   : lValue = SWPUSEEMS(lFlag)

  Return   : The previous setting

  Default  : Enabled

  This function enables or disables use of EMS for swap image storage. The
  return value is the previous setting.  If EMS use is enabled, the parent
  image can be saved (and restored) much more quickly that if it were
  written to disk.

  Note that when both XMS and EMS memory are available, the swap system
  will use XMS first.