[digitalradio] lpt to com port assignment?

[kg4kri]

Hello all,
I am trying to set up my computer to key my radio rather than the el cheapo way 
of using vox. I have built a circuit to use the 25 pin lpt jack, but I do not 
know how to assign this jack as a com port. Most of the digital programs I use 
only specify com ports, not lpt. I do have a 15 pin connection, but I am not 
sure what the proper connection would be. I am obviously not very knowledgeable 
about computers, so any help is appreciated.
Thanks, Daniel
KG4KRI --... ...--