Halt;
or
Halt (ExitCode: Integer);
Halt terminates the program with exitcode 0. If ExitCode, is specified, it is returned by Halt on exit.
Halt is an Extended Pascal and a UCSD Pascal extension.
     program HaltDemo;
     begin
       WriteLn ('This string will always be this program''s output.');
       Halt;  { Terminate right here and right now. }
       WriteLn ('And this string won''t ever!')
     end.