This dialog lets you check the virtual key code for any key combination (except Windows reserved key combinations such as Alt+Tab). You can then insert the virtual key code into the last active edit window at the current cursor position.
Press Ctrl/Shift/Alt and the key you wish to discover. You can see the virtual key codes for left and right ctrl/alt combinations by checking the "Distinguish between left and right ctrl/alt" checkbox.
To close the dialog, click the Close button or press Shift+Esc.