Sorry Sandrin.. RPC or RCP...
Well gentlemen ... the output we found was the call for a Java class via ExternaType (javaObject) .. invoking the Clipboard.
From what we have seen, the RCP generates screens with GUI face and was not the right solution.
In our project, each 3270 screen (EGL TUI), were in different JVM .. (copy data from one screen and paste it in another, another system) so we had to use the Clipboard ..
ojomenezes