~~NOTOC~~
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:!: Available in version 1.3 and later.
====== MSG_PreUpdate ======

===== Description =====
"MSG_PreUpdate" is a message that is automatically sent by the game before all of the units are updated. It is sent even when the game is paused.

The frame advance process is as followed:
  Loop 1, 2, or 4 times based on speed:
  {
    PreUpdate
    Units
    PostUpdate
    return to top of loop
  }
  FrameAdvance
  If high FPS is on, run FrameAdvance again for the interpolation frame
  Start next update
\\
===== Examples =====
<code 4rpl>
:PreUpdate
   trace("Pre")

:Once
   RegisterForMSG("MSG_PreUpdate" "PreUpdate")
</code>

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