The simplest way to load ebooks onto your H2O via WiFi is to access a Calibre server using the built-in web browser. Transferring ebooks from your PC to your Kobo is doable, but it would take some technical knowledge on the part of the user (e.g. how to setup a file server on the H2O). Unfortunately, it doesn't seem to add the new files to the library unless the device is using the internal web browser or connected via USB.