If the control that has the focus is a control that accepts mouse clicks (such as a radio button, a check box, or a button) the Spacebar will "click" on the control as if the mouse were clicked.
In a grid control, Spacebar will behave as if the selected row had been double-clicked by the mouse.
If the control that has the focus is a text field, the Spacebar will erase the field (if it is selected or add a space to the field.
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