GT_ADDREC() Attempt to APPEND BLANK with optional retry
GT_FILLOCK() Attempt to FLOCK() with optional retries
GT_LOCKING() Function to lock a datafile/record and return the success
GT_NETUSE() Attempt to USE a dbf with optional retry
GT_RECLOCK() Lock a record with optional retries
GT_USEDBF() Open a table
GT_USERLOCK() Apply/release a software semaphore