Function ReadExit() Foundation
Establishes the up arrow key and down arrow key as exit keys for READ.
ReadExit( [<lToggle>] ) --> lReadExit
When ReadExit() is called without an argument, it returns the current setting as a logical value. If <lToggle> is passed, it becomes the new setting and the value of the old setting is returned.
ReadExit() is used to permit or to disallow the termination of the READ command or the function ReadModal() by the up arrow and down arrow keys. In the default setting, the first GET input field in a GET list cannot be exited with the up arrow key and the last GET input field cannot be exited with the down arrow key. This setting can be changed with <lToggle>.
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