Chapter 8. Intrinsic Special Variables

Revision History
Revision V6.1-000	28 August 2014	In “$Key”, added information about using $KEY with SOCKET devices. Added two new sections called “$ZCLose” and “$ZKey”.
Revision V6.0-003	24 February 2014	Corrected the description of “$ZVersion”. In “$Key”, specified that GT.M maintains $KEY for terminals.
Revision V6.0-001	21 March 2013	In “$ZCOmpile”, added a point about $ZCOMPILE returning a status of 1 after any error in compilation.
Revision V5.5-000/2	31 October 2012	Added the descriptions of “$ZALlocstor”, “$ZREalstor”, and “$ZUSedstor”.
Revision V5.5-000/1	05 October 2012	Improved the description of “$ZTrap”, added an example of “$ZCMdline”, and added Linux, Solaris, and z/OS examples in “Create a shared library from object (.o) files”.
Revision V5.5-000	15 June 2012	Added the description of “$ZONLNrlbk”.
Revision V5.4-002B	26 December 2011	Conversion to documentation revision history reflecting GT.M releases with revision history for each chapter.

This chapter describes the M Intrinsic Special Variables implemented in GT.M. All entries starting with the letter Z are GT.M additions to the ANSI standard Intrinsic Special Variables. None of the Intrinsic Special Variables are case sensitive.

M Intrinsic Special Variables start with a single dollar sign ($). GT.M provides such variables for program examination. In some cases, the Intrinsic Special Variables may be set to modify the corresponding part of the environment.

	Note
	None of the Intrinsic Special Variables can be KILLed. SETting or NEWing is generally not allowed, but is specifically noted in the descriptions of those that do.

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