tpf

from The Free On-line Dictionary of Computing (8 July 2008)
Transaction Processing Facility
TPF

   <operating system> (TPF) A {real-time} {mainframe} {operating
   system} released by {IBM} around 1976.  TPF is particularly
   suited to organisations dealing in very high I/O message
   switching and large global networks.  Current users include
   British Airways (reservations), VISA International
   (authorisations), Holiday Inn, and Quantas.

   TPF was traditionally a {370/Assembler} environment although
   the latest, release 4.1, contains {C}.  Formerly known as ACP
   (Airline Control Program), it was renamed "TPF" to suggests
   its greater scope.

   It is common for TPF sites to use IBM's {MVS} and {VM}
   operating systems for {off-line} processing.

   (1996-08-27)