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 SWPUSEEMS()
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 Purpose:
 Enable or disable use of EMS by the swap system.

 Syntax:
 lValue = SWPUSEEMS(lValue)

 Parameters:
 lValue  Enable / disable indicator.

 Returns:
 The previous setting.

 Default:
 Enabled.

 Description:
 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.

 Example:
 SWPUSEEMS(.F.)    // Disable use of EMS when swapping                       

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

 Note also that the BLINKER environment variable setting /SEc will override
 this function.