Interrupting and modifying Windows messages

[vdraceil]

Hi experts,i know that it is possible to intercept windows messages(keyboard events,mouse events etc).is it possible to stop those messages from reaching windows and modify them?
I mean can we intercept keystroke(say 'A' key) and change it to another keystroke(say 'B' key),with key 'A' being pressed not noticed by windows?--i.e.,if the user presses 'A',windows must sense it as 'B'.

hope i'm clear..
is this possible with VB6(using any API calls)?

[leoce7]

Refer to KeyPress, KeyDown & KeyUp events ........ lots of info for these and fairly straight forward. I would make a function for the event and pass in as a parameter which key was pressed and then utilize a "Select Case" structure followed by ASCII code identifiers to process which keys were pressed and how to proceed.

[vdraceil]

Refer to KeyPress, KeyDown & KeyUp events ........ lots of info for these and fairly straight forward. I would make a function for the event and pass in as a parameter which key was pressed and then utilize a "Select Case" structure followed by ASCII code identifiers to process which keys were pressed and how to proceed.

I dont think u got my point,i know how to handle those events-those events will occur only when ur form has the focus!!...what i want to do is to create an application that runs in the background and intercepts and modify all win messages like keystokes and mouse clicks.
intercepting is quite easy with a few API calls..modifying is what i'm unable to do