This pen is the ultimate crossword accessory, following knitting needles. You input the letters you know, and it does the rest. It will check your input against its 250,000 strong database of words, giving you a suggestion to what 11-down might be. This answer can then be written down using the very same pen. And it is even suitable for both left and right handed people.

Brill! Now how am I going to teach grandma which buttons to press and when?