My folks have web access via their cable provider, and are renting the
'modem'. They recently asked me if it would be better for them to buy
one instead of renting it.

My question is, what would need to be done for them to use a purchased
one? Would I be able to set it up for them, or would they have to pay
the cable co to do it?

Would it be better for them to buy one vs renting it?

--
Stevo