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 SWPUSEUMB()
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 Purpose:
 Enable or disable the use of UMBs by the swap system.

 Syntax:
 lValue = SWPUSEUMB(lValue)

 Parameters:
 lValue  Enable / disable indicator.

 Returns:
 The previous setting.

 Default:
 Enabled.

 Description:
 This function enables or disables use of UMBs (upper memory blocks) for the
 resident kernel. If available, and their use is enabled, the resident kernel
 which remains in memory during execution of the child process will relocate
 itself into a UMB, freeing up slightly more memory.

 Example:
 SWPUSEUMB(.F.)    // Disable use of UMBs when swapping                      

 Notes:
 Note that the BLINKER environment variable setting /SUc will
 override this function.