Distributed processing communications software support for operation within an SNA network
E. S. Harrison · IBM Systems Journal · 1980
It has been shown that the 8100 Information System and DPPX operating system can assume the external appearance of three different physical unit types (PU_T2, PU_T5, PU_T4), and these physical units can be dynamically started and stopped within the same DPPX system. The DPPX system has the capability of attaching o a host system, operating as a stand-alone system independent of any other system, and operating as an interconnected system.