In the Play store, search for Microsoft Remote Desktop. If you search for RDP, you'll get a lot of other non-Microsoft apps listed. I've tested out the Android version and it seems pretty nice.
|Microsoft Remote Desktop client for Andoid|
The controls are simple:
- By default, it shows full screen.
- Tap the zoom icon in the middle left for a larger view that you can scroll around it.
- Tap the keyboard icon in the middle right to bring up a keyboard.
- Press the menu button on the device to bring up special keys for the keyboard such as shift, control, and the Windows key.