To know if certain modeless windows such as the Properties Window, DesignCenter, and DbConnect windows are currently displayed in an AutoCAD session, there are binary system variable that contain this information.
OPMSTATE – Properties Window
ADCSTATE – AutoCAD Design Center
DBCSTATE – Database Connectivity
All three system variables are set to 1 when the corresponding window is visible, and are set to 0 when not visible. To programmatically control the visibility of these modeless windows, you can send the AutoCAD commands such as “PROPERTIES”, “PROPERTIESCLOSE”, “ADC”, “ADCCLOSE”, DBC” and “DBCCLOSE” commands.
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