I ordered a 2407WFP online last night.  When I received the confirmation it was listed as a 2407FPW.  I had to cancel and reorder (because Dell added another random monitor to my order that I didn't order).  Now it says I ordered a 2407FP.  Is there a difference between the 2407WFP, FPW, or FP.  If not, why the different letters???