Small application to send keystrokes to other apps

I need a simple application to run on a normal windows machine. The goal of the application is to enable keystrokes to be send to multiple other windows. The application should be configurable for up to 4 seperate windows, all which may be maximized OR minimized. The selection of these windows should be from a drag/drop list of all active windows, which lists the window names + ID (in case all the windows are called [login to view URL] for example you can tell them apart). Then you run the application, select the windows you wish to send keystrokes to, then you click "START". Now every keystroke you do should automatically go to those 4 windows that you have selected in the application until you click the STOP button. This should be a very small project and easy. I need it working in a compiled fashion in VS 2003 and have the source code delivered and owned to me when it is done. Thanks!