Waits for a message to be received at the specified (named) port, which must have been opened by a call to OPENPORT() within the current ARexx program. The returned Boolean value indicates whether a message packet is available at the port. Normally the returned value will be 1 (True), since the function waits until an event occurs at the message port.
The packet must then be removed by a call to GETPKT() and should be returned eventually using the REPLY() function. Any message packets received but not returned when an ARexx program exits are automatically REPLYed with the return code set to 10. For example:
CALL WAITPKT `MyPort' /*Wait awhile*/
