How the ICU fits into the computer system

GDDM-PGF V2R1.3 Interactive Chart Utility

How the ICU fits into the computer system

GDDM-PGF V2R1.3 Interactive Chart Utility
SC33-0328-01

The ICU is a program that makes use of two other, closely related, programs: the Presentation Graphics Routines (a part of GDDM-PGF) and GDDM Base. The ICU uses the Presentation Graphics Routines to draw charts, and these routines in turn use GDDM Base to draw the lines and areas that make up the chart. (The ICU, the Presentation Graphics Routines, and the Vector Symbol Editor are three programs that together make up GDDM-PGF.)

GDDM in turn makes use of IBM interactive subsystems to manage jobs like data storage and input and output. The subsystems it uses are CICS, IMS, TSO, and VM/CMS. In their turn, the subsystems depend on operating system programs that control how computer resources are used from moment to moment.

Further details are given in the GDDM System Customization and Administration manual for your operating subsystem (see "GDDM publications" in topic I.2).

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