What event is trigged on lid close?

I am trying to figure out what kind of acpi event is triggered on lid
close and looking to be able to manually trigger it. When I use X's
display management tools like 'xset dpms force off' while playing
audio, it seems to pause as the display turns off. But on lid close
that doesn't happen. I want to be able to trigger that lid close
event manually if possible. I've read acpi(4) and other manpages
hoping to figure something out, but because I'm new to interacting
with the BSD kernel, I don't really know how to do this. I know
a bit of C programming if that requires it. I would like to know
what acpi event is trigged on lid close. Thank you!