Remote Access on different wireless access point?

I have the ASUS Transformer and am able to run remote desktop at my work computer great through the 3389 port which i manually set-up. Works beautifully. When I go home, though, I am unable to connect. I assumed that pocketcloud supported the ability to remote in from any wireless access poitn. Was I wrong. Suggestions? Thanks. (Running Windows 7 Pro at work)