If it's a windows machine, the easiest way if it's just to enlarge the stuff on the screen is to use the magnifier under the accessibility tools or Ease of Access depending on which version you have.

If there is not enough detail on what's on the screen, that won't work and you may have to build something with large and small images. If for example you divide the flowchart into eight images side by side in a table or something you can use animation to have larger versions of each of those sections hidden under it.

Check out this demo of a technique this guy used with two pictures and animation (to prevent the loss of quality from the standard zoom)

http://www.larkinweb.co.uk/computing...technique.html