Well I'm left handed in everything but writing (I can use my left too, I'm just dominant in my right). I don't use a mouse on the computer, I use a tablet. Depending where my tablet is on the table (i.e whichever side is less messy) I switch between using my right and left hand to grasp the pen. I haven't used a mouse in a real long time but when I did I used my right hand.
