The information in the To area of the Compose Outgoing Fax window goes on the cover sheet (except for the Alias). The only information that is absolutely required is the Fax #. The other information makes it easier to identify who is getting the fax.
Different styles have different number of fields in the To area. For example, the default Simple style only has the following:
For a complete list of optional data fields, see Optional Data Fields.
The Alias feature allows you to type all the information for a person or group once and associate the data with an alias name. Then when you want to send a fax to that person or group, simply type in the alias name and Faximum automatically enters the correct information in the To area.