Is there a resource that would help me decipher Hilton rate plans?

Example: What do codes like "UNM" or "OG01BR" spell out?

Maybe that would help us finding better rates. :-)

Also, each line of a Hilton folio contains a description (such das "Guest Room", "Self Parking", "City Occupancy Tax" etc.) with a cryptic code in the "ID" column, such as "CDUGAY" (no, that was neither in Paris nor was I particularly lighthearted and carefree), "RKHEYO" or "ROBMAK".

These IDs can change during a stay on the same reservation for the same item at the same price - so "Guest Room" can have a specific ID on one day, and another ID on another day, although the rate does not change. Knowing what those codes entail is probably not going to help save money, but I'm curious. :-)