The ATTEMPTLOCK Command
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Syntax:
     ATTEMPTLOCK [<retries>] [<delay>]

Argument template:
     RETRIES/N, DELAY/N

Function:
     If you are in network mode (see Networking), you have to get write
     access to the address file, before you may modify anything. To do
     so you have to use the ATTEMPTLOCK command. If someone else in the
     LAN keeps the write access to the desired address file, this
     commands returns an error code in RC and RC2 (see FREELOCK).

Argument description:
        * RETRIES

          Maximal number of retries, if the attempt to get write access
          did not succeed at once.

        * DELAY

          Number of seconds that shall pass between two retries.

Results:
     The following error codes can be returned in RC2:

        * RXERR_ENVCHANGED