Most on screen keyboards (such as the onscreen keyboard that comes with Windows XP) send normal keyboard event messages to the external target program to type text. Every software keylogger can log these typed characters sent from one program to another.[18] Additionally, keylogging software can take screenshots of what is displayed on the screen (periodically, and/or upon each mouse click), which means that although certainly a useful security measure, an on-screen keyboard will not protect from all keyloggers.
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