- These are license packs, for number of 4100MFP's on network... 1x 4100mfp = 1 Device.This pack will license up to 5 "devices".- Communications Package - This package incorporates the Secure Access Package, so there is no need to purchase that separately. In addition to the features of the Secure Access Package, this allows for Send-To-LAN FAX and Send-To-INTERNET FAX. When using the Send-To-LAN FAX feature, it sends two files to a specified folder. A HEADER file and a IMAGE file. The fax hardware/software (Fax Hardware/Software is a Third Party Solution - NOT INCLUDED) monitors this folder for these files. It takes the Sender info and Fax numbers from the HEADER files. The IMAGE file contains the actual fax document(s). Among others, supports Castelle Faxpress, RightFax, Bizcom, GoldFax, etc.