MTCS
MTCS (Minimum Teleprocessing Communications System) was a transaction processor that ran on IBM mainframe systems under OS/VS1 and DOS/VS.[1]
MTCS was available from IBM and designed for rapid, low to medium-volume online processing. This process was entirely interactive (screen-oriented using 3270 display terminals).
The 'official' version of MTCS was a single thread only and was a forerunner of CICS before it was released. An unofficial and multi-threaded version of MTCS was developed by Littlewoods Pools, UK at the same time as a multi-threaded "MTCS bridge" (middleware MTCS simulator) became available for running MTCS transactions directly under CICS. This version was also used by other customers including Granada Productions under a license agreement.