InterFAX - Version 1.1.4 Interfax is a utility that lets you send faxes from your computer, using your internet connection. Simply type out the fax, enter the name who it's going to, enter the FULL international fax number and a subject for the fax and click on SEND. You also get a phone book, which can hold an infinite amount of names and numbers for quick faxing, a list of country codes is provided, should you need to look one up.