Other triggers and scripts
Larger gimmicks don't fit in one trigger. Triggers can call each other and pass values.
Calling a custom event
A Custom event is an event with a name. Another trigger runs it with Send Event and that name.
Send Event Delayed calls it a few seconds later. UdonSharp scripts can call custom events with SendCustomEvent too.
Another trigger's variables
Set Another Trigger's Variable and Read Another Trigger's Variable work with another trigger's variables. A change made this way syncs and runs On Variable Changed on that trigger as usual. To call with a value, set the variable first, then send the event.
Using another script
Use another script (under Other triggers) calls functions of an UdonSharp script in the scene, or changes its values. Put the object with the script in its target, and Use lists what the script offers.
Notifications from other scripts
The Notified By Another Script event receives what scripts such as video players or pens send. Put the object with the script in Notified by, then pick What happened. Tripwire registers for the notification when the world starts; there is nothing to write by hand.
Tripwire knows the notifications and operations of ProTV, VizVid, USharpVideo and VideoTXL. For other scripts, Set up by hand… lets you pick the name and how to register. See Video players.
Calling Udon directly
Anything not in the lists can be called with Call Udon API, under Advanced in Detailed mode: search the methods and properties Udon exposes and pick one. It also covers members with out parameters (received by variables), members that report back to this trigger's events (loading text or images from the web...), and changing part of a position or color. See Call Udon API.