keyboard application

i want to make a program who stay resident in memory of the computer and allow me to activate not all keyboard, only a few tastes
i open a word document
in word i type "John goes to the library"
but my program not allow me to use "a" and "o" character
so the text on word will be "Jhn ges t the librry"
Who is Participating?
BlackTigerXConnect With a Mentor Commented:
see this article to see how a system wide keyboard hook is done... that's what you need:
Wim ten BrinkSelf-employed developerCommented:
Make a system service and install a systemwide keyboard hook. Means you have to create two projects. A system service that keeps running and a DLL that is used for the hook...

However, you will really annoy quite a lot of people with such an application and it is considered a very bad practice in general. Besides, you cannot prevent all keys from being pressed. (Some special keys will always be detected.) Furthermore, a simple copy&paste could make it possible for users to still use certain characters, even if you block the keys.
why do you need something like that?
maybe we can find another way to solve your problem
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