SETENV SID for Rac Environment with 4 nodes

Good morning folks!

I have a doubt about SETENV parameter on extracts and replicats.

Today i have a Cluster with 4 nodes. My whole configuration for GondenGate is in only one node because I don't have any ideia what kind of parameter I put in this field.

My Example:

EXTRACT intext

(SETENV ORACLE_SID=prenf1)  -- I have prenf1, prenf2, prenf3 and prenf4

USERID ggate, PASSWORD ggate

TRANLOGOPTIONS INTEGRATEDPARAMS (MAX_SGA_SIZE 100)

EXTTRAIL /u01/app/ggate/dirdat/lt

TABLE sh.customers;

How can I put a SID Like UNIKE NAME  in this parameter which can be recognized in all nodes?

Thanks and best Reguards.