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 SWPUSEXMS()
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 Purpose:
 Enable or disable use of XMS memory by the swap system.

 Syntax:
 lValue = SWPUSEXMS(lValue)

 Parameters:
 lValue  Enable / disable indicator.

 Returns:
 The previous setting.

 Default:
 Enabled.

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

 Example:
 SWPUSEXMS(.F.)    // Disable use of XMS 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 /SXc will override this function.