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Swap Files
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 The default swap file name is OVL_SWAP.$01.  If the file OVL_SWAP.$01 is
 already in use, then the file OVL_SWAP.$02 is used.  In a similar manner, if
 OVL_SWAP.$02 already exists, then OVL_SWAP.$03 is created.  The overlay
 manager continues to look for an unused file name in sequence, up to
 OVL_SWAP.$099.  The overlay manager will terminate in failure after
 unsuccessfully attempting to use the final file name, OVL_SWAP.$099.

 WarpLink-overlaid Clarion programs will run other WarpLink-overlaid Clarion
 programs by using distinct swap file names.  If the swap file names were not
 distinct, then the program that was run would overwrite the old swap file 
 and cause the original program to fail upon return.  The WarpLink overlay 
 manager automatically deletes these swap files upon program termination so
 that old swap files do not use up disk space.  If WarpLink does not delete a
 swap file due to improper program termination (such as rebooting the 
 computer prior to exiting the program or after loss of power), you should
 delete the swap file from DOS.  These deletions will free up disk space and
 speed up the overlay manager's task of finding a unique swap file name.