key-is-button: system variable

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Epsilon User's Manual and Reference > Variable Reference >

key-is-button: system variable

Default value: varies

When you click on a button in a dialog, Epsilon returns a particular fixed keystroke: Ctrl-m, the abort key specified by the abort-key variable, or the help key specified by the HELPKEY macro. To distinguish actual keys from these buttons, Epsilon sets the key_is_button variable to zero when returning normal keys, and to a nonzero value when returning one of these button keys. It uses a specific value for each button in a dialog.

More info:

Window Events (Primitives)
Windowed Dialogs (Primitives)

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key-from-macro Variable Reference key-repeat-rate