The value of this variable is the fraction of the screen height to use as the maximum height for the pop-up-message-dialogpop-up-message-dialog text-box. Provided so that a message box with lots of text that might fill the screen will instead scroll in order to avoid filling the whole screen with a message box.
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
The documentation is described in introduction.htm and the index is in index.htm.
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Created 2000.10.5.