IBM Distributed Office Support System, or DISOSS is a centralized document distribution and filing application for IBM's mainframe computers running the MVS and VSE operating systems.
DISOSS runs under both the CICS transaction processing system and the IMS/DS transaction processing system, and later versions use the SNADS architecture of peer to peer communication for distributed services.
The different systems that use DISOSS for document exchange and distribution vary in their implementation of DCA and thus the end results of some combinations are only final form (FFT) documents rather than revisable form text (RFT).
"[2] It was a key part of IBM Systems Application Architecture (SAA), but suffered from a reputation as "difficult to understand" and "a resource hog.
[8] DISOSS was implemented by the city government of Long Beach, California during 1983–1984.