How can I get a texturetoggle to have multiple targets?
One of the settings for a env_texturetoggle is "target brush(es)". I have multiple indicator lights that i need to have different names so naming all the same is not what I want. I tried separating the names by spaces and semi-colons and it doesn't work.
Just give the indicator lights a name (say, "ind_Lights&1") and give the associated checkmark a name (say, "ind_Check&1"). Go to the checkmark and put the indicator light's name in the "Indicator Lights" entry. When you check the checkmark, it'll automatically light the lights.
Try using logic_relay's for this. Add a texturetoggle for each indicator set and set the relay to fire both at the same time. For the outputs you only want to fire on indicator, you can still use the set the individuals to fire.
PortalStories.com
"Oh, in case you got covered in that repulsion gel, here's some advice the lab boys gave me: DO NOT get covered in the repulsion gel."
Yeah, I was afraid I would have to do that. But are you sure there isn't a way to have 1 texture toggle target multiple brushes? Otherwise, why would the name for the setting be "target brush(es)"? Maybe the the plural part is just for bold names (meaning multiple brushes with the same name). Oh well.
You could try using wildcards. For example, name your brushes "indicator1" and "indicator2" and then make the target brushes point to "indicator*". I don't know if this works outside of the I/O system though.
Portal 1: Portal Pro, Resurrection, Dyad, Rexaura
Portal 2: [Coop] Electrophobia, [PTI] EotM Collection, [SP] Aperture Halloween
Um, why?
PortalStories.com
"Oh, in case you got covered in that repulsion gel, here's some advice the lab boys gave me: DO NOT get covered in the repulsion gel."
By indicator lights i'm assuming you do mean the orange/blue overlays? If so just name them the same name, worked for me. 
Um, why?
It's a figure of speech. It means I feel disappointed. And I feel disappointed because now I have more work to do.