I'm thinking seriously of moving to Mac now from a PC and Windows XP Home which I know was 32-bit. Snow Leopard I understand is 64-bit but many applications 32-bit. I assume a basic MacBook will handle both. The truth is I haven't a clue what 32-bit and 64-bit mean!! Can someone explain to me in words of one syllable what these numbers mean and what difference they are going to make to me when I make that move. I am planning on Snow Leopard on a white MacBook with 4GB RAM simply because I am a writer and the best writing software, like Scrivener, is only available for the Mac. Thanks.