Text in Opengl .. question from newbie

hi ,
i would know if it s possible or not to send some text in an existing opengl windows.

i try to say with my bad english that i want to put some text when i m in a game, for example Half-Life or Quake.

I want to have a little programme that send me text alarm while i m playing.
(Mail receive or appointment …)

i try with standart API , bitblt , copymemory … but i can really send stable information , the result is awful.

if i create my windows , with context etc … ok.
if i try to reach game opengl window , system Hang.
(se of getdc , getwindow …)

Hmmm… i’d say it depends on the operating system you’re using somehow, but the first problem I would expect is, that the window you’re trying to display something in, is not yours, meaning it belongs to another process.
Maybe there is a way with some quake script thingy to do this?