New to CVS

[Rob Beach]

Hi all,
        As the subject says i'm new to CVS and from what I have read about it, 
it
sounds really good. "BUT" I was wondering if it can handle excel .xls files
? and word .doc files the same way it can handle .txt files ? as I am
looking for something that can do what cvs can do but i have spreadsheets
that about two or three people will need to edit and update at a time. At
the min they have to wait for each other to get out of the file.

also there are people that need to just look at the spreadsheets to get data
off them can you set it up so people can view the files but not edit them ?
is there that sort of security on cvs ?

Hope that makes sense and sorry for sounding so thick
Cheers,
Rob.