Tatess is right with the info. but i don't think it would help you at all.

If you'll apply for a visa authentication among other things, you'll have to do that thru Wide World Express/DHL courier services. They will let you know what documents to submit, fees to pay etc. Qatar Embassy has stopped entertaining applicants in their office, everything thru WWW/DHL. You can't even get thru their telephone lines - numbers are busy from 8am - 5pm :D

good luck!