|OnScreen: for Windows; On-Screen Keyboards with Assistive Technology; Version 1.80; User's Guide|
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OnScreen WAS NOT intended to emulate the Windows keyboard interface in its entirety. Although OnScreen appears to operate just as the keyboard does, due to its design, certain applications may not function properly with OnScreen. Special software considerations have been made to make OnScreen as flexible as possible, and the notes below offer information on configuration settings that may make OnScreen work within your applications. Also below is a complete discussion of settings, options, and possible solutions to any incompatibilities.
OnScreen WAS intended to make certain operations easier because the user can concentrate on the task at hand, not which input device is required at the moment.
OnScreen allows the user to keep their eyes on the screen, so the flow of work on a computer is uninterrupted. In essence, OnScreen is just a standard Windows application that provides special functionality.
When asked "How do I do a right-click from OnScreen?" we try to be patient and explain that OnScreen is a text input tool, and not a pointing device. The touchscreen / pen interface replaces the desktop mouse as the pointing device, and OnScreen replaces the physical keyboard. You need a pointing device to work with OnScreen, and if you can't perform a right-click with your pointing device, you need to talk to the pointing device vendor for options (or refer to IMG's TouchRight Utilities which provides right-click options & tools for pointing devices). Also note there are keyboard short-cuts/options that can be used via OnScreen to possibly resolve the underlying access issue - Shift-F10 will open the context menu (or the Properties key on the 104 layouts) which often is what people want when asking about the right-click action. Finally, look at a standard physical keyboard, and find the right-click button - it isn't there (unless the keyboard has some sort of pointing device capability).