More Standard Declarations

PID, the type of a process identifier, and PGRP, the type of a process group identifier, are described in Section 4.1, page , since PGRP is referenced by the GetDevPGRP and SetDevPGRP procedures, described on page .

 

VAR
  NullPID: PID;

NullPID contains the `default' value for the type PID, namely zero.