How to make launchpad system alias generic

Hi,

I created some launchpads using LPD_CUST.

For each launchpad I specify a system allias which corresponds to an RFC destination or portal system alias.

The question is how do I make the system alias generic, so that whether the launchpad is invoked from DEV, QA, PROD in ECC the correct RFC is used.

Is there a system alias mapping table or does this need to be done programmatically.

For example system alias SAP_MYAPP should work in DEV, QA, PROD and portal.

Thanks