A walkthrough of doodad state triggers:
First know what each function does.
Enable: Will enable the doodad state of units. Most units start out this way. However some (protoss buildings without a pylon) don't.
Disable: Will disable the doodad state of units. Since most units don't start out this way, disabling is commonly used when people use the doodad state trigger. Most common effect this does is cloaking men or buildings. It has other effects on other units though, more explained later.
Toggle: This is just a general term. Basically, the unit you toggle is either disabled, or enabled. When you toggle it, it's just reversing it's state. So if you toggle an enabled Marine (all Marines start out like this) then you will disable it. But if you toggle a disabled Marine then he will become enabled.
To learn more about the effects of units when you disable them, refer to this file:
http://www.staredit.net/tutdb/index.php?si...6&id=41&lang=en