two technical notes:

first: yep, in most routers, the "application" field is a few characters to let you write something so you remember what the hell those ports are for next time you go in to add a forward. So it doesn't have, in most cases, the least bit of bearing on things.

second: I highly discourage the use of the DMZ. It basically defeats half the purpose of having a router in the first place (namely that the router is a particularly effective natural hardware firewall, due to the whole nature of NAT). Putting a computer in the DMZ is tantamount to exposing it to raw unfiltered internet, which is inadvisable for the average user (and if you don't know why, you fit into the category of people who shouldn't be).