ssh clarification needed

[Anne Wilson]

I frequently use ssh+keys to do yum updates on my server, but I've not used it 
on other parts of the LAN.  Now I want to, and I realise that I'm not clear on 
one very important point.

Is a ssh key specific to a computer, or to a user?  That is, does my key 
pertain to any box on the lan, as long as I'm the user?  Or is it machine 
specific - in which case I would think that every user would have the same 
key, which seems unlikely.  Then again, is it a combination of user and 
computer, in which case every user needs a specific key on every box he uses 
(assuming that he may want to ssh to other boxes).

I suspect that the last case is the correct one, but I want to be sure.  
Thanks

Anne
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