Niet afdrukbare buttons in pdftex?

[Gilbert van den Dobbelsteen <GILBERT@login.iaf.nl>]

Hi there,

I need to put a button on a page which is available normally, but does 
not appear on the printed output. 

Does anybody know how this can be done in \CONTEXT?
I couldn't find it in core-ref, though I guess it is pretty straight 
forward.

Another one: I am creating A4 single page .pdf files from png scans. 
Besides the scan some text (and the button mentioned before) needs to 
be present. To accomplish this I setup the png scan as a page-
background (haven't done that yet but I use the s-pre-xx as an example)
so normal text can be present on the page. Is this the way to do that, 
or are there other methods which I didn't see?

Gilbert.