|OnScreen with CrossScanner: for Windows; OnScreen Keyboards with Single Switch Access; Version 1.78 Release 4; User's Guide|
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The Allow Cancel is default On, and this affects the choices if Mouse button is selected as the input device.
When On, this allows the "opposite" mouse button (Right if Left button as input, Left if Right button as input) to cancel the current scan (LineScan, FingerScan, etc.), reset, and prepare for a new scan.
When a keyboard key is the input device, then the Escape key cancels. If the Escape key is used as the input key, then the space bar can be used to cancel a scan.
Swap Mouse Button Note: If the mouse buttons are "swapped", the term "Left button" refers to the primary button (selection button) - even though this may be the physical mouse right-button.