How can I use trgger to open door?

[ashyboyblue]

Could someone tell me how to get a trigger to open a door?
I don't want to use a button trigger rather a trigger that is invisible ingame.

[wootmonster]

Use a trigger_once or trigger_multiple. Outputs in the trigger's output tab:

OnTrigger -> Door -> Open

[ashyboyblue]

Thank you :D