{Maxavail.PAS}
  ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
 {Sample code for the MaxAvail function.}

 type
   FriendRec = record
     Name: string[30];
     Age: Byte;
   end;
 var
   P: Pointer;
 begin
   if MaxAvail < SizeOf(FriendRec) then
     Writeln('Not enough memory')
   else
   begin
     { Allocate memory on heap }
     GetMem(P, SizeOf(FriendRec));
     { ... }
   end;
 end.