How to access NOTIFYICONDATA structure if I didn't create it

[RCMoonUnit]

I want to modify an icon in the systray which was created by a external program already running when my script starts . I'm assuming I want to modify its NOTIFYICONDATA structure (since that works fine for an icon I create myself). How would I do that?

Can I create a new structure using the parent window handle? Won't it be bad to have two? If I can create a new one, how would I get a handle to the icon itself since the application might have brought it in from anywhere. (I can get a handle to the parent window OK).

Thanks for any suggestions.