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- This routine returns the state of the check box managed by an external area of type %bp_RadioButton.
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- If the value returned is equal to 0, the button has not been checked.
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- If the value returned is equal to 1, the button has been checked.
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- The parameter passed to this routine is the external area.
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- Written by François Marchal, © ACI 1991. Detailed description and source code in MPW Pascal.