Well, there are several ways depending on what you actually want. Do you just want to send them a copy of your note that day? If that's it, after you sign the note and the letter writer comes up, you don't have to write a letter. Just print the "detailed noted" or "H&P" to your fax machine and to the consultants fax number. They have it immediately after you sign it.
Or if it's later on, you can just hit "CTRL-P" and the print note or letter writer comes up.
I personally write a letter with a generic template saying "thanks for asking me to give my opinion" and then the assessment and plan and off it goes by the print/fax function.