Introduced in the 1995 ANSI M[UMPS] language standard.
The value of this variable identifies the current depth of nesting of TSTART commands (but... keep in mind, there is only at most one transaction active at any given time).
IF $TLEVEL WRITE !,"Don't nest these activities"
Every TSTART command increments the value of special variable $TLEVEL (initial value is 0).
This document is © Ed de Moel, 1995-2005.
It is part of a book by Ed de Moel that is published under the title "M[UMPS] by Example" (ISBN 0-918118-42-5).
Printed copies of the book are no longer available.
This document describes the various special variables that are defined in the M[UMPS] language standard (ANSI X11.1, ISO 11756).
The information in this document is NOT authoritative
and subject to be modified at any moment.
Please consult the appropriate (draft) language standard for an authoritative definition.
In this document, information is included that will
The MDC cannot guarantee that these 'next' standards will indeed appear.