Locks.prg
 Database file locking functions
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     AddRec( <nWaitSeconds> ) --> lSuccess

     Attempt to APPEND BLANK with optional retry.

     FilLock( <nWaitSeconds> ) --> lSuccess

     Attempt to FLOCK() with optional retry.

     NetUse( <cDatabase>, <lOpenMode>, <nWaitSeconds> ) --> lSuccess

     Attempt to USE a database file with optional retry.

     RecLock( <nWaitSeconds> ) --> lSuccess

     Attempt to RLOCK() with optional retry.