VO: Visa Office
NDVO : New Delhi VO
GCMS : Global Case Management System (Like RTI in India), it will give your file status, takes 35 days once you place order. Check GetGCMS.com.
You can keep the documents ready, I think you have 45 days to accept.... If nothing in one month then submit for OINP as after May @ 435 you might miss both ...... Safest is go ahead with OINP...