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The Val member represents the current value of the slider as a PML REAL (in fact always an integer).

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The Range member allows the slider range and optionally the step value to be set or queried. The granularity of the slider movement is determined by the specified step increment, i.e. a move event is generated at each step increment within the slider’s range. The range limits must each be an integral multiple of the step size (else an error is flagged
The RESET action of a form (from reset, CANCEL or QUIT actions) will only reset the slider current value not other slider properties. So if you redefine the range while a form is displayed, and press the RESET button, the range will not revert to the previous settings. You will have to do this from reset button’s callback and/or the form’s CANCELCALL callback.

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