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N_BADLOCK()        Get number of record that caused N_MLOCK() to fail
N_BLIP()           Display message or call function while in retry loop
N_CHECKF()         Check which station has a file locked
N_CHECKR()         Find the station that has a record locked
N_CHECKS()         Find the station that has a semaphore locked
N_CHECKU()         Find the stations that have a DBF file opened
N_EXCL()           Set Clipper's exclusive flag
N_ISEXCL()         Determine if a file is open in exclusive mode
N_ISFLOCK()        Determine if the current station has a file locked
N_ISRLOCK()        Determine if record locked, or get record number
N_ISSLOCK()        Determine if semaphore locked, or store semaphore in array
N_MLOCK()          Lock multiple records in a file
N_MONITOR()        Initiate activity monitoring for a database file
N_SETMULTI()       Enable multiple record locks with RLOCK()
N_SLOCK()          Attempt to lock a post-and-wait semaphore string
N_SUNLOCK()        Unlock  semaphores issued by the current station
N_TBEGIN()         Start an explicit transaction
N_TCOMMIT()        End an explicit transaction
N_TIMEOUT()        Set time limit for attempting to use file or apply lock
N_TROLLBACK()      Roll back a transaction
N_TSTATUS()        Determine if TTS is active
T_ROLLBACK()*      Rollback (cancel) currently active transaction
T_START()*         Disable implicit transactions and activate TTS at station
T_STATUS()*        Determine if TTS is active
T_STOP()*          Re-enable implicit transactions prior to ending app.
T_TRANS()*         Start or end a TTS transaction