Using Java code to redirect control to R3 T-Code

Hi,

I want to use java code to redirect control to back-end R3 T-Code from Portal. Basically I want to place this java code in portal server and depending on the request I want to redirect it to R3 T-Code. I can do this using iView but the problem is, I have many such T-Codes and will have to create 1 iView for each T-Code. But if I use Java program the I can put a condition and do the re-direction to the required T-Code. So can some one tell me how I can re-direct to R3 t-code using java code? I also have to pass some parameters to the R3 t-code so please help me.

Sunil.