[cobbler] How Cobbler Triggers Works

[slgray]

Hi, I am new to cobbler and I want to use triggers use to do some post
install tasks, suck as create a system profile when the system finish the
first boot from cobbler .
I have read the docs at
http://cobbler.github.io/manuals/2.6.0/4/4/1_-_Triggers.html. But still do
not know how to call the triggers, which url I should  send request to.

Hope somebody can provide detail docs for how triggers work, Thanks.