Can you add wifi through software only? No, it’s a hardware feature so yes you do do need the plug in card. You may have Bluetooth, in which case you may be able to access the Internet through your computer. You’ll install ActiveSync on your computer, connect to ActiveSync from your Pocket PC and you’d be away. As long as you were in range of the host computer.

Themes? There are themes for Pocket PCs, Google and find them. The themes are not the same themes as a desktop uses so you can’t use a desktop theme on a Pocket PC. If the themes come ‘unpacked’ (which they normally will) you can just download them with Pocket IE and install them. If they’re wrapped in a ZIP or RAR file you may need to work harder to install them, if they come with a desktop installer you’ll need the desktop…

Can you rotate the screen? Yes, but (a) you need to tell the Pocket PC to do it and (b) you’ll have to Google for how to do it unless there’s an obvious program installed on the device. I’ve used Axiums, but a long while ago, my best recollection is from HP devices; there was some magic to do a screen rotation, like holding down a button and tapping on the time.

Sorry, can’t be more help.