Operating Systems / Execution Control / Execution Environments
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The most useful Operating Systems / Execution Control / Execution Environments manuals :


CICS
Entire Bookshelf
Programming Reference
Programming Guide
Messages and Codes
IMS (DC)
Entire Bookshelf
Command Reference
Application Programming (DC)
Messages and Codes Vol 1 (Abend Codes)
Messages and Codes Vol 2 (DFS Messages)
ISPF
Entire Bookshelf
Dialog Developer's Guide
User's Guide Vol 1
User's Guide Vol 2
Messages and Codes
Language Environment
Entire Bookshelf
Programming Reference
Programming Guide
Run-Time Messages
OPC
Entire Bookshelf
Quick Reference
Programming Interfaces
Messages and Codes
TSO/E
Entire Bookshelf
Command Reference
Programming Guide
Messages
z/Architecture
Principles Of Operation
z/OS
Entire Bookshelf
System Codes
System Messages