It's not that we encourage him to, but my nephew Jerry just gravitates towards computers. That's probably from seeing us in front of our laptops, and the natural inclination to emulate what we're doing.
Oh, we try to keep him out, but he can fenagle his way in. He has a method, too: he'll climb up my lap, or squeeze in the space between my knees. A twist here and there, and he's sharing the seat with me. It's at that point I disconnect the keyboard and just work with the mouse. I fear it won't be long, though, till he catches on.
Please ignore the mess around us.