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

 Syntax   : lValue = SWPUSEUMB(lFlag)

 Return   : The previous setting

 Default  : Enabled

 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.

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