The concept in question is quite simple: a primary LCD would be visible at all times, and when the occasion called for another panel or two, they'd simply slide into view, ready to serve as a number pad, or settings control, predictive text display, or even a full-fledged split keyboard.
Windows 7 users can change the size of text and icons using the Display control panel and can zoom in on text using a magnifier tool that can be activated in the Ease of Access control panel, which contains other options for making items on the computer easier to see.