[fpc-pascal] Limits loop for

[EC-RED]

When compiling the following program :

Var a : longWord;
Begin
for a:=1 to 4294967294 do   Begin
    Writeln(a);
  End;
End.

I get the following error message: "Error : range check error while 
evaluating constants" and not compiled.

How do I make a loop up to 4294967294?
What is the limit of a for loop ?

Thanks.