When does it work to discipline a 1 year old?

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My DS has just turned 1 and is a very curious boy. He is drawn to things like the lap top/DVD player/mobile phones etc. He also loves drawers/cupboards/the toilet(!).

What's the best way to discpline him from playing with these potentially dangerous and breakable things? Most times I can distract him with something else and I also change the tone of my voice and show him I'm not pleased when I tell him not to do certain things, but I'm not sure how much he understands.

Any advice?

We dont just say "no", we explain him why we dont want him to do this or that.
If he does something naughty again (like throwing yet again food on the floor) we warn him (he is 14 months) that if he does it again, he'll go in the corner for one minute.
and if he does it again, we put him there (and much to our amazement he stays there).
and i think he understands quite well...