Connect via bluetooth
Allow the iPad to connect to the computer via bluetooth. That way you can connect when you are unable to be on a local network.
We need a bluetooth solution for non-3G,4G ipads
For iPhone and iPad with 3G support (you have to be connected to Internet with a SIM-card),
there is a solution on how to connect if you are not in a Wi-Fi network: http://airkeyboard2.skygears.com/faq#q3