Getting text from external application

[n1mda]

Hi,

as the topic says, I want to get a string of text from an external application running alongside with my application.

I've heard I can do this with the Accessibility API but I have found zero information about it. Technically, I don't want to get the text from x,y-position since a windows size can always change.
I'd rather get the text from a memory location. Question is, how do I do this in code? What techniques do I have in handy?

Very grateful for answers!
n1mda