Program names.

One standard program named : saplfdcb , when asking for access key, gives : R3TR-FUGR-FDCB

Another standard progrm named : sapmm03e , when asking for access key , gives : R3TR-PROG-SAPMM06E

Why is the first one having "FDCB" in the end instead of full program name? Does it actually mean, getting access key for function module 'fdcb' ? or the program only? This confuses me a bit. Please enlighten.