Question about the skill channel

[You Win]

on the channel option... there are a lot of them i don't understand the usetage.
i only know how to use visible the rest i don't understand. can explain to me?

targeting image
physical spell
universal spell
unique cast

 

[You Win]

can't some1 pls help me on this?

 

[ChirusHighwind]

Channel Options

The Targetting image when checked will display an ubersplat under your cursor to indicate the area of casting. You know, the circular thing that appears to indicate its an AoE spell.

For the others, I reference thehelper.net: (http://world-editor-tutorials.thehelper.net/cat_usersubmit.php?view=14972)
"~Physical Spell: This determines whether or not the spell goes through Magic Immunity or not. If this option is checked, that means you will get no error when trying to cast it on units with the Anti-Magic Shell buff or who are magic immune.

~Universal Spell: This means it goes through anything. This option really isn't necessary unless your using stricter JASS methods, checking the options if it is Universal or not. But I will not get into that.

~Unique Cast: Another strict JASS method. You will most likely never use this, because it's more for 'tallying', and isn't used by the spell."

There is more information on the "channel" ability there, if you need it.