Mac OSX also has an application called Grab embedded in it. Can't remember how I found it, looked through the self-styled "Help" pages with key-words like "print screen" or "print display" to no avail. "Screen dump" just brought up some references.

Grab allows you to capture any area of the screen, either self-defined (select), window or whole-screen. Can be saved, appears in my "Pictures" folder as a TIFF file, which my printer copes with. I think I've successfully emailed these.

Mac Help quote "To save a screen shot, choose File > Save. Grab saves screen shots as files in TIFF format. You can use the Preview application to view these files and export them to other formats, such as JPEG."

Ross