Newbie question on arrays and indexing

[Webb Sprague]

Hi Everybody,

I am afraid this is just a stupid question, so if it is, please be nice 
and point me to some documentation...  :)

I am wondering what is the best way to handle indexing into a list or 
tuple.  The issue at hand is that I want to play around with virtual 
clocks, as per Garg 2001, but all the algorithms are in terms of 
indexing using integers, like Matrix[3,4].

Thanks
Webb