<< if you can, what if you get like a 100 56k modems. will that download at 500k then? >>
No. Because,
a) You will have to pay for 500 phone lines
b) Your ISP will have to have 500 + nodes in your area
c) Your ISP will have to, by pure dumb luck, not notice that you're connecting 500 times with the same login name
d) You will need a motherboard with 500 PCI slots
e) The bandwidth will just not work out to 500k/sec no matter how hard you try.