Slashdot videos: Now with more Slashdot!
I don't think it's worth setting up something elaborate for an 18 month old, all they really need is something that looks like a computer so they can feel that they're doing the same thing as mummy and daddy do. An old laptop works well, or one of the cheap toy computers. My son is three at the moment and sufficiently self-controlled to be allowed to play with my laptop. I set him up with a text editor and let him "type".