Remote Function Call (RFC)_For WWI Generation Server

Dear Experts,

I have tried creating an RFC for the WWI Generation Server and received an error message upon testing its connection by clicking the "connection test" button. I have obtained the details from my saprfc.ini file and i believe this is the instruction found in the cookbook. Can anyone please share what tcode, screen or navigation should i use or do to get the correct information of the following fields in creating RFC:

1. Program ID

2. Gateway Host

3. Gateway service

Thank you so much in advance.

Kind regards,

Mark