[HELP script] How know event methods?

Hello,

How can I know differents method for create an event ?

For exemple : part of client.lua in es_freeroam

https://gyazo.com/a84af089ad668807d4bfbac9ff1d9a58

Ii there a reference document where understand arguments of “SetNotificationMessage” or “AddEventHandler” for example ?

I have already this : http://www.dev-c.com/nativedb/ witch gold mine.

Thank you for your help.