The Infraport on your computer probably uses IrDa which is a protocol mainly for transferring data. I think IrDa is two-way while tv remotes and such are most definitely one-way. The hardware is probably compatible with each other you probably just need to bypass the IrDa protocol I don't know if it's possible but check out the following websites
http
/www.lirc.org/
http
/winlirc.sourceforge.net/
http/www.girder.nl
I built an IR-receiver for the serial-port to control my desktop with the help of these sites. It works beautifully and wasn't hard. You might be able to build an emitter following the same principle.
/Good Luck
good cheese doesn't walk