Custom
CommonCustom Event
A named event, run by a Send Event action or by other scripts via SendCustomEvent.
Other triggers call it by its Name with Send Event, and UdonSharp scripts with SendCustomEvent. One trigger can't use the same name twice.
It also works as a shared list of actions: put them here once and call it from several cards.
Names start with a letter and use only A-Z, a-z, 0-9 and . Names Udon already uses (Start and so on) and names starting with Tw, tw_ or v_ are not allowed.
When Send Event's Run on is Everyone's screen or Owner's screen, the call goes out as a VRChat network event. Network events never reach players who join later. By default each event can be sent 5 times a second; extra calls wait in a queue on the sender. For a state everyone should share, use synced variables.
Other triggers and scripts shows how to call it.
Official docs: Custom Network Events (VRChat), SendCustomEvent (UdonSharp)