You might want a control to display data, such as product code numbers, that should not be changed by users. To help protect the data from change, you would lock the control.
You could also prevent the control from receiving the focus, which means that users could not click it or activate it with the TAB key. Disabling a control this way makes clear that its data cannot be changed.
To apply these properties in a form or a report, you would select a control, click the Properties button 
on the Form Design or Report Design toolbar, and click the Data tab. There you would choose the No value for the Enabled property, and the Yes value for the Locked property.
The table gives details of the properties and their interactions.
