Windows 7 tags broken down

[Stickfigure]

Just found this out. Very interesting.

the names are actually not arbitrary. Taking your one example:
GRC1CULFRER

Very basically it's broken down to this:
G.RC1.C.UL. .FRE.R

Written as individual fields for this example:
Field 1: G
Field 2: RC1
Field 3: C
Field 4: UL
Field 5: (blank)
Field 6: FRE
Field 7: R

Field 2: indicates which branch. RC1, Beta1 (B1) etc.
Field 3: C or S (client/server)
Field 4: what version (UL=ULtimate, HP=HomePremium, etc)
Field 5: architecture. x86 is blank. X64 gets an 'X'
Field 6: debug build or not (FRE/CHK)
Field 7: Retail or OEM (R/O

 

[Gamer]

Cool to know. I was wondering why the ISO named the DVD like that. Mine is named:
GRC1CULFRER_EN_DVD

 

[Ekhaatvensters]

I've got the same, I assume FRE means that it's not a debug build right?

Wouldn't want mine to be filled with debug code.