trigger inappropriate activation

Use trigger to activate and to disactivate GUI.Box and GUI.Label when the FPS collides with the trigger. But all gameobject are activating the trigger, as well as the components of the physics. How to make with that only the FPS activates the trigger? I am thankful anticipatedly

You can either check the tag of the colliding object, or use layers to explicitly say what can collide with your trigger.

http://unity3d.com/support/documentation/ScriptReference/Component-tag.html

http://unity3d.com/support/documentation/Components/Layer%20Based%20Collision%20detection.html