Is there anyway/alternative method of using GetObject for Internet Explorer?

Is there a workaround for GetObject? I saw some things yesterday but it
seemed to involve downloading something, which doesn't work for me at work
(we're not supposed to use downloaded things etc). And IE doesn't add
itself to the existing applications listing (or whatever it's called) like
programs that are associated to file extensions - excel, word, adobe etc.

Basically, I want to target an existing IE window, the name of it will be
unique, and then from there, either copy the contents of that web page into
a cell, or be able to target a textbox on that page called xxfundsxx (for
example) to return the contents of that textbox into a variable.

Navigating to the page and then getting the data (which I can do, but is not
possible in this situation) won't work due to it being an IE based
application that is always the same web page, but it extracts data for
different accounts etc when it is opened. Has to be from an existing window.

Cheers.