Hello Fong:

My answer was reasonable for Emailing but completely useless for Faxing. My apologies.

I couldn't find a sample fax cover sheet. It would be a text file that can be created with Windows' Notepad application. Using the codes below, I think it would look something like:

To: $R
From: $F
Date: $D

Please find attached your invoice ... and so on.

Codes:
$D = today’s date in MM/DD/YY format; always 8 characters
$I = station ID; variable length
$N = total number of pages; variable length
$P = actual page number; variable length
$R = recipient’s name; variable length
$F = sender’s name; variable length
$S = title; variable length
$T = current time in HH:MMpm format; always 7 characters