Fetch for Update

I haven't been able to find much information on Fetch for Update. Does 8.3
support this command??

If so, could someone please point out my error in the following?

Bob


BEGIN
   SELECT count (p_id.pid.process_id) INTO Proccount
   FROM p_id.p_id
   WHERE process_id = new.process_id;

 Declare
 procgraphic cursor for
 select process_id
 from p_id.p_id
 where p_id.p_id.p_id_id = proc_count.p_id_id;

 Begin

 Fetch first  in procgraphic for update
 Update p_id.p_id
 set proc_graphic_position = one
 From graphics.proc_position
 where graphics.proc_position.proc_count = proccount;