How can I pass a parameter to a script on another game object when the game object collides with a trigger collider?

Questions & Answers
1

Using the Standard assets 2D character controller scripts, how would I communicate to the PlatformerCharacer2D script that it can jump again when it passes through a collider?
As in the image below, if the guy jumps through the black rectangle trigger collider it should be able to jump again. The script next to the picture is attached to the rectangle collider, but obviously you can’t make a reference to that script like I tried to make as the component required is on a separate game object.

Here is it

2

Is PlatformerCharacter2D part of a special assembly/namespace?
In which case you need to add it with a using.