There is 2 Different programs you can use to open 2 Rappelz on the same PC/Laptop.
The 1st is Sandboxie.
This program is very easy to use, Once you've installed it, there's a procedure you need to follow to get 2 rappelz to work.
The 1st thing you will need to do is open up Sandboxie. up the top click "Sandbox" then go to "Default box" and then click on "Sandbox Settings" This will bring up another window. Once you've opened that, Click the + sign next to Restrictions and look for "Drop Rights", Once you've found that make sure that box is
NOT checked, otherwise this will not work. once you've unchecked it simply click Apply then ok.
Once you have Done that you can close The program itself because it will minimize to the taskbar.
Make sure you don't already have rappelz running or it will say "Game hack detected" or "A communication error has occurred", Once that's check/Rappelz is closed Follow on
Right click your rappelz icon, and select "Run Sandboxed", a window should pop up, make sure "Default box" is highlighted and you check the box that says "Run as UAC Admin".
After that click ok, and you should get another pop up saying "Allow application" Just click Yes/Confirm or whatever it is.
once that Window is up, Login to rappelz like normal.
Next is the 2nd account, for this you dont need to worry about sandboxie... once you have your 1st account online (using sandboxie) Simply open up Rappelz normally by double clicking.
Then enjoy 2 Rappelz clients on 1 PC
It might get a little laggy depending on your PC. If you're using it for buff slave or a Shop in Flea. make sure you minimize the Alt/account you're not playing on, and you should be fine
The other program is called VM-ware, but this requires a complete installation of an operating system, so it's like a PC inside your PC.. Sandboxie is much easier in my opinion.
PM me if you need more help
-Legion