I'm a long time windows user. I bought a MB 2 days ago. I must say that I'm fully impressed with my Mac and I'm proud of my decision. Here is my list of questions. 1) How or where do I check which version of OS I'm using? 2) Where do I check what is the installed RAM size? 3) I have a dvd (contains photos) burned using sonic software. My mac doensn't recognize it as DVD and says that I inserted the empty CD. If I run the same DVD in my Sony WAIO laptop it shows all the photos. Is this the problem with the sonic software or my Mac doesn't recognize it as DVD? 4) I bought the HP printer with my Mac. (100 $ MIR offer). Is there a way I can connect the printer to my wireless router network so that I can take the printout in my Mac as well as in my Sony WAIO? I know this is not about Mac, but still appreciate the reply.