ActiveFax can be used to integrate fax and E-Mail functionality into various operating environments without the need for extensive modifications.  The ActiveFax Server can also be used from within Microsoft Windows to send fax documents and E-Mails from any other operating system, such as UNIX.  ActiveFax supports all important network protocols (e.g. LPD/LPR) for the connection to the Fax Server. Therefore, sending a fax message becomes as easy as printing a document. Furthermore, it is possible to send fax documents to the Fax Server with a serial interface (RS-232) or the file system (NFS, Samba, etc.). ActiveFax interprets the printer sequences of HP-LaserJet, Epson-LQ and optionally Postscript. This guarantees that a fax message or E-Mail is exactly of the same appearance than the corresponding printout. So-called data fields can be used to specify the parameters (recipient, subject, priority, etc.) already from within an application.