A bulletin board and electronic mail system from Soft Arc that supports both Macintosh and Windows clients and servers and is popular among printers and separators as a way for their clients to deliver jobs to them via analog lines. One of the DAX configurations integrates First Class over ISDN lines, allowing printers and separators to maintain their current workflows, but with far greater bandwidth (and hence, faster file transmissions).
FIRST CLASS
Meaning of FIRST CLASS in English
DAX English glossary of key connectivity terms. Английский глоссарий основных терминов по коммуникациям DAX. 2012