PL> A function is used to return one value.  Regardless of the
 PL> value, the name of the function is actually what is
 PL> returned when called.. other than that it's like writing a
 PL> procedure that only returns one value.  Therefore a
 PL> function will not have a var in it's header.. :)

Ain't necessarily so - a function may return var parameters just like any
other procedure, as well as its function result:

program off_the_top_of_my_head;

function is_a_letter (var c : char; var is_a_comma : boolean) : boolean;
   begin
      is_a_letter := true;
      is_a_comma := (c = ',');
      if not (c in ['A'..'Z']) then
         if c in ['a'..'z'] then c := upcase (c)
         else is_a_letter := false
   end;

var ch : char;  comma : boolean;

begin
   read (ch);
   if is_a_letter (ch, comma) then
      writeln (' is a capital letter')
   else begin
      write (' isn''t a letter at all');
      if comma then write (' .. but IS a comma');
      writeln
   end
end.

E&OE, Ian

--- MaltEd 1.0.b5