Question linking a note pad , web browser with vb2008

[cool.vijit]

hi!!
i m developing and on screen keyboard as a part of my school project in vb2008
now, i have a notepad opened up or a firefox browser...

now i click in the note pad or in address bar of firefox, so that when i press any button, the letter gets typed there... just like the windows on screen keyboard does...
i dont know the txt file name or anything...
if its not opened it shud jus ignore the typing

how can i link them with my vb2008 onscreen keyboard???
i am a beginner so please elaborate a bit..