TAL Programmer's Guide

CRE Services
Introducing TAL
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When you use the CRE, each routine in your program, regardless of language, can:
Use the routine’s run-time library without overwriting the data of another run-
time library
Share data in the CRE user heap
Share access to the standard files—standard input, standard output, and standard
log
Call math and string functions provided in the CRELIB file
Call Saved Messages Utility (SMU) functions provided in the Common Language
Utility Library (CLULIB file)
Without the CRE, only routines written in the language of the MAIN routine can fully
access their run-time library. For example, if the MAIN routine is written in TAL, a
routine written in another language might not be able to use its own run-time library.
Section 17, “Mixed-Language Programming,” gives CRE guidelines for TAL programs.
The CRE Programmer’s Guide describes the services provided by the CRE, including the
math, string, and SMU functions.