If you're using m$ remote desktop on your Mac to connect to your pc, you're using the RDP protocol...which the equivalent iOS app would be PocketCloud from Wyse or any other RDP app.
Though you could remote control using SplashTop. It's a great app however it doesn't use RDP, you just have to install the host software which is free. SplashTop is good for remoting into a pc within your internal network. It even ports the sound to the iPad!
However, if you're looking for someone to connect to a work computer or server on the outside that uses RDP such as windows terminal services or Citrix, the PocketCloud is the right app for you.