Help with VB 2005 - Reading from an external app's textbox

I've got an application that continuously feeds information into a textbox from the internet.

I would like to create an application that can run in the background and "grab" the information in that textbox without interfering with the usability of the computer (does not cause any windows to popup or text to be selected).

All I require is the bit of code that will read in the external apps textbox info...

Please quote me a price if you think this is possible... Thanks!