17.1 Globals Overview

FreeM supports typical M globals, which are often described as persistent, hierachical sparse arrays. Globals make it relatively simple to include persistent data in an application without requiring the developer to use an external database management system, and offer syntax and semantics so similar to M local variables and structured system variables that moving from one to the other is seamless.

Each global comprises three elements:

• An alphabetic name beginning with a caret (^) or a caret and a percent sign (^%)
• Optionally, one or more comma-delimited subscripts, enclosed in parentheses
• A value of up to 255 characters in length

A leading percent sign in the global name will force the named global into the SYSTEM namespace of the current FreeM environment.

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