can a grob be initialized to be bigger than screen?

[webmasterpdx]

Is this to be an editor? I don't speak spanish (my brother is the spanish speaking one in my family :-) and so, I tried to translate the text using google translate....it's not clear from the translation.
The reason I ask and the reason I wanted to know about the GROB is that I'm thinking of writing an SDK that has a GUI builder and a decent program editor. I figure to scroll around the text of the program, dragging using a larger GROB than the screen would be useful to see the text for long lines of code.
Also, if you are developing something like this already, it would seem like a pointless effort (other than as a learning exercise for myself).
What were the other apps mentioned in the text below (that this is supposed to be part of). I'm interested.
Thanks
-Donald