How does Splunk know which script to run for a modular input?

[wegscd]

I'm writing my own modular input, using the docs, Python examples, SNMP TA, and the Splunk Add-on for ServiceNow as a learning base.

Looking at the Splunk Add-on for ServiceNow, there are a kajillion .py files in bin/. How does Splunk know that snow.py is the main for the modular input, instead of one of the other scripts?

[mreynov_splunk]

http://docs.splunk.com/Documentation/Splunk/6.3.1/AdvancedDev/ModInputsSpec

[ehaddad_splunk]

you can go to /README/inputs.conf.spec. There would be an entry such as:
[snow://]
snow.py would be the main starting point.