PowerBook 3400 Modem AT Command Set missing

Steve Martin writes: "I have a new PowerBook 3400c and can't find a reference for the internal modem's AT command set anywhere. The "Modem/Ethernet User's Manual" in the Apple Extras folder makes reference to a file called "Modem AT Command Set (a file on your hard disk)" but no such file exists." He contacted Apple about this and received this reply:"Someone messed up and it's not there. I'm tracking down a copy to get posted online."