The PC market is fast shifting into a touchscreen world, and Apple is leading the charge. Some new numbers from the analysts at Canalys note that in Q4 of 2012, one in every three PCs shipped was a tablet, that Apple’s iPad accounted for about half of them, or one in every six of PCs. By combining PC and tablet figures – a logical thing to do, given that many are substituting tablet purchases and usage for PC purchases and usage – Canalys figures that worldwide PC shipments are actually on the rise – up by 12% to 134 million units. That’s in contrast to figures from Gartner, which in January noted that Q4 PC shipments were down by 5% on last year – without factoring in tablets.