How to set the RFC destination dynamic

Hi,

Can some one let me know how to set up the RFC dynamic? Like for example i have two system sys1 and sys2. From sys1 i want to call Sys 2. I can call the FM with destination as sys2. My question is that after the object is moved to the quality system, the destination would change rite..so instead of hardcoding the sys2 ip, is there any way bu which i could get it dynamic so that i can use that in sys1?

Thanks.