They nearly always unscrew anticlockwise - that's anticlockwise looking down onto the glass globe - if the glass should snap off from the screw base (they sometimes do) you can use a pair of pliers or even a finger into the hole to turn the base but be sure to isolate the power first - last week I forgot to do this and felt very silly.
Take care...
Peccavi
November 2009
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
