They're called tamper proof pin head screws. Don't know where you can
get a driver for them.
You might be able to snap the pin out of the head by using a finish nail
nail set and hammer.
I was able to do this with 2 of 4 pin head screws. I couldn't snap the
other two pins off, so I decided that there wasn't anything in there
that I could fix anyway (ala 'fox and the grapes'!).
I needed a bit of an oddity for the bottom of a Toshiba Laptop.
$20 for the security bit kit I bought at Sears ,,, lots of security bit
doohickeys in a silly rubber holder block that plug into a screwdriver
handle,,, has come in handy quite often. Of course I had already bought
several $5 or so single 1/4 drive bits special ordered from my friendly
neighborhood hardware store - now I getting to be pretty much unsecure.
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