[Techtalk] Users and Groups GUI in FC3

[mkhayes]

I've been running Linux (FC3) for 3 weeks and will soon be stripping 
everything but Photoshop out of Windows.  I haven't had this much fun 
messing up my computer since the early 80's.  (64K anyone?)  I'm having 
reasonable luck finding solutions to problems, but some basic info is 
harder to get. 

In FC3 GUI  applications/system settings/users and groups in my account 
properties/groups:

When I installed FC3, the only group I was in was mk.  This allowed me 
to do nothing much at all.  Goal was to rip cds to the server 
downstairs. (Nascent HTPC)  I couldn't access the drive to play a cd.  
While now I might go to a command line, the gui gave me this wonderful 
option, and it worked.  I made myself a member of just about every group 
except root.  My hardware was my own again. 

I suspect this isn't the best setup, but I can't find anywhere what 
these mean/do/should-be, and since there are 45 of them, unchecking and 
rebooting would be no much fun.  Apache is obvious, but what's 
nfsnobody?  Any help would be appreciated.  When I search, all I come up 
with are command line things, so if there's documentation, a URL would 
be wonderful.

Thanks in advance,
MK

Biggest Linux problem so far:  GUI solutions created, GUI solutions not 
supported.