Initial Screen 
Initial Screen
Comparing Programs in the Current R/3 System
Comparing Programs in Different Systems
To compare a program in the current system with one in another system, choose Compare different systems from the initial screen of the splitscreen editor. A field appears on the screen in which you can enter the RFC destination of the R/3 System containing the required program.
In the RFC destination field you can only enter systems for which an entry exists in table RFCDES.