FORWARD
Is used to introduction a method which is defined later but used earlier. This is why PASCAL compiles much faster than C, it does not require 2 passes to know all methods, then compile - we forwardly define a method header so you will not get an "Unknown method" error.
Program testforward;
Procedure First(n:longint); forward;
Procedure Second;
begin
WriteLn('In second. Calling first...');
First(1);
end;
Procedure First(n:longint);
begin
WriteLn('First received : ',n);
end;
begin
Second;
end.
Source: Reserved Words