Heres an easy way to do dual client on your RF.
Steps
1. download this..
2. After downloading and successful installation copy your rf folder to another disk if ever you have partition or other folder so its not on the same folder as your main rf.
3. Open Sandboxie Control -> Sandbox -> Create New Sandbox -> rfonline then click OK.
4. Right Click on "Sandbox rfonline" -> Sandbox Settings
5. Go to "File Migration" and change the value to "3000000" = 2GB Then press OK
6. Right click "Sandbox rfonline" That we created -> Run Sandboxed -> Run Any Program
7. Press "Browse" and Search the rfonline exe file or patcher from the copied rfonline folder (not the main folder)
8. Finally we Finish !!!!! Press OK and it will run a 2nd client of rfonline
Press thanks if this helps you in any way.