ClearPath OS 2200 Series Release 13.2 Software Planning and ...

Distributed Data Processing Program-to-Program Communications (DDP-PPC)
Refer to the SYS$LIB$*DDP-FJT-3.README element for additional release
documentation.
5.14. Distributed Data Processing
Program-to-Program Communications
(DDP-PPC)
This subsection describes the considerations for DDP-PPC. Refer to the DDP-PPC
Implementation and Administration Guide before installing DDP-PPC.
General Considerations
You must install I18NLIB before you execute DDP-PPC. This is necessary because
DDP-PPC uses ELMS, which in turn, requires I18NLIB.
DDP-PPC starts a run named BNKLST when the PPCMASTER detects that the DDP-PPC
subsystem has been deactivated since the last execution of the PPCMASTER. This run
is used to obtain BDI information for the current execution of the PPCMASTER
subsystem. It writes the information into a file named SYS$LIB$*DDP$BNKLIST. Once
the information is obtained, the run terminates, usually after about 5 minutes. The dump
routines then read this file whenever a DDP-PPC dump is taken. You should make sure
the SYS$LIB$*DDP$BNKLIST file is secured.
Because DDP-PPC executes as a fixed-gate subsystem, the files containing the
subsystem (SYS$LIB$*PPC$$GATES) must be owned by a user-id that has fixed-gate
subsystem privileges at shell level and can deactivate the subsystem.
You can change the file ownership through the security management product after
completing the DDP-PPC installation. Refer to the DDP-PPC Implementation and
Administration Guide for more information about user-id requirements for running
DDP-PPC.
The SYS$LIB$*PPC$$GATES.SSD element determines the security (ring level) of the
DDP-PPC subsystem. For Fundamental Security environments it executes at the
TRUSTED level, for all others it executes at the SHELL level.
DDP-PPC determines the security level of the system during the SOLAR installation
process and loads the appropriate version of the SSD element. If you change security
levels after installing DDP-PPC, you can either reinstall DDP-PPC or copy the appropriate
SSD element with the following commands:
• To go from a FUNDAMENTAL level to a SECOPT 1, 2, or 3 level, enter
@COPY,A SYS$LIB$*PPC$$GATES.SSD/SHELL,SYS$LIB$*PPC$$GATES.SSD
• To go from a SECOPT 1, 2, or 3 level to a FUNDAMENTAL level, enter
@COPY,A SYS$LIB$*PPC$$GATES.SSD/TRUSTED,SYS$LIB$*PPC$$GATES.SSD
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