A master interfaces file contains entries for all SAP servers on the network.
The master interfaces file can be used with every server and client connected to the network. By distributing copies of a master interfaces file, you can ensure that all SAP products on the network interact with one another. Distributing copies of one interfaces file (a master file) with entries for all Adaptive Servers is the easiest way to maintain consistency in the interfaces files in a homogeneous environment on a network.
You can make all changes to one version of the file and then copy the updated master file to all appropriate SAP directories.