Microsoft Windows 95 supports the use of a pen even with pen-unaware
applications. For such applications, Windows provides a means for the pen to mimic both
mouse and keyboard data. It does this in two ways.
The first method, the Pen Message Interpreter, is described in the "Windows"
section in the previous chapter. The second method involves two utility
"applets" called Writing Palette (WRITEPAL.EXE) and Screen Keyboard (SK.EXE), both
supplied as installed applications. Writing Palette allows the user to enter
handwritten text for those occasions when the Message Interpreter fails to detect an
input prompt. For example, when running an MS-DOS text editor in a window, the
user can input handwritten text through the Writing Palette utility. The Pen
API translates the handwritten text into characters and displays the result in
the writing window. The user can then correct the text if necessary and tap the
OK button when the corrections are recognized. Windows feeds the characters to
the pen-unaware text editor as a series of WM_KEYDOWN and WM_KEYUP messages as
though they were typed at the keyboard.
The Screen Keyboard applet displays an image of a typical keyboard on which
the user can "type" by tapping the keys of the on-screen keyboard
with the pen. Each key is sent as soon as it is typed. This does not require
recognition because no handwriting is involved.
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