Both technogeek00 and John.Edwards have got it, Remote RDP and PocketCloud are your best bets. I used a Beta version of PocketCloud and found the bubbly UI unnecessary. I've kept Remote RDP and haven't tried the production version of PocketCloud, so keep that in mind.
I suggest you try both, especially if you need to use encryption as only the pay version of both include it. Also, the pay version of PocketCloud support VNC, encrypted VNC, and VMWare remote view (IIRC is based on VNC); Remote RDP doesn't have this capability and has a separate program called Remote VNC, but doesn't have encryption capabilities as of this writing. If it was me and WYSE got rid of the bubbly interface in the Beta and made it easy to use, I'd go with PocketCloud since it offers a lot more features at a more competitive price.