Description: Invisible object, used most often as a type of helper object.
Some common uses are:
The Logic object is considered a "unit" (even though it doesn't perform any actions by itself). It therefore has to be selected under the Units menu, or created via the createUnit command.
In multiplayer, a game logic will always be local to the host computer, if it was placed in the mission editor. This works on both dedicated and player-hosted servers.
If a game logic is created via scripting after mission start, then the logic will be local to the client that created it.