Editing Games:Halo 5: Guardians/Forge/Scripting (section)

==Message and Power Channels Intro==
'''Messages '''and '''Power State''' changes send broadcasts that all objects on your map can detect. This broadcast system is completely under your control and is the main way to have objects and their Scripts communicate with each other. (There are other ways to have some objects interact with each other, but these are workarounds that are difficult to use and less reliable.)

Forge provides us with 26 message and 26 power channels, both named like the NATO phonetic alphabet (alpha to zulu). Message and power channels of the same name don't affect each other.

Messages and Power State ''broadcasts'' are simply that: messages. They contain no information or options. When you use the '''Message: Send''' action, the broadcast is instantly sent for the selected channel and only lasts for that instant (one game tick). Every script that contains the '''Message: Received''', '''Power: Check''', or '''Message/Power: Multi Conditions''' will listen and activate their Actions when appropriate.

*These broadcasts are for your customization; the game doesn’t automatically create any broadcasts.
*There are 26 channels to send these broadcasts over. They are named like the NATO radio message standard for spelling the alphabet: alpha, bravo, charlie… zulu.
*Both messages and power channel changes behave like events that will be detected by script conditions on the next script cycle check.

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===Messages===
Messages are simple events that you can broadcast from any object that can contain scripts. Any Script that has 'Message: Received' Conditions will listen for a message broadcast being sent over the channel it is listening to (alpha-zulu).

===Power States===
You can use the '''Power: Set''' Action to attempt to set a State to '''On''' or '''Off''' or to '''Toggle''' it from whatever it's current value is. When a Script Action attempts to set a Channel that's On to On, or Off to Off, then no change occurs and no broadcast is sent. When '''Toggle''' is used, or anytime the State switches between On and Off in either direction, a broadcast is sent

At the start of a match or Forge session, every channel's Power state seems to behave as if it’s Off.

*Setting it to Off doesn't trigger any scripts.
*Using the Toggle or On options turn it On and conditions that listen for On events trigger.
*Conditions that listen for Off events don't trigger at match start, so the behavior doesn’t seem like the channels are switched to Off right when the game starts. It's like they were already turned Off before the game started.
*A Multi condition with an On Power condition set to Off, will trigger without changing that power state as long as it has another condition that broadcasts and causes it to be evaluated.

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===Message/Power: Multi===
The '''Message/Power: Multi''' Condition includes checks for the current <span style="text-decoration: underline;">States</span> of Power channels. If a Condition checks for a power channel state to be On or Off, then that Condition is true even if the power was set previously. It doesn't have to act like an event that just triggered. Note that at least one of a Multi's conditions needs to be triggered during the previous cycle for the script to activate.

<div class="spoiler">'''<span style="text-decoration: underline;"><span style="text-size: 15px">Detecting Power State Broadcasts</span></span>'''
Power broadcasts can be detected by either the Message: Received or Message/Power: Multi conditions. Power: Check simply detects broadcasts for On or Off States. It is only triggered when a Power State changes to the State it's set to listen for (On or Off). It will not detect when an action attempts to set a channel to its current state (no broadcast).

Message/Power: Multi can be quite complicated, but it detects Power change broadcasts just like the Power: Check condition does. It also has a Toggle option which detects a Power broadcast whether it's changed to On or Off. A Multi condition with Minimum of 1 with only one Power condition set to On or Off works exactly like the equivalent Power: Check condition. If the same script is changed to the Toggle setting, it detects both On and Off broadcasts.

'''<span style="text-size: 15px"><span style="text-decoration: underline;">Testing Power State On/Off Values With Multi</span></span>'''
Message/Power: Multi is the only way to test the value of a Power State outside the moments it gets changed and broadcasts. The Power State On and Off conditions within Multi conditions evaluate to true (and count as 1 for the Minimum to trigger setting) whenever that Power State currently has that value. It's not limited to when Power channels broadcast when they change. However, at least one of the conditions set in Multi must be broadcast to trigger the Multi condition.

The Power State Trigger and Message Send conditions within Multi can only trigger as a result of broadcasts.</div>