I have a weapon that features an object effect that results in concussion.
I made a message that says "You have a concussion".
How can I link the two so that when the effect is applied, the message is displayed?
I have some examples of how this was done with scripts in Oblivion but it seems FO3 uses a text box system. This is fine with me as I am a scripting noob, but I can't see how the connection is made.

Of course, I only want this message displayed when the weapon is used and the effect applied to the player, not when it hits NPCs.

Any assistance with this would be much appreciated.

For your effect, use a script effect instead of a base effect, and code the base effect and add a http://geck.gamesas.com/index.php/ShowMessage command.

In order to show a message only when the effect is applied to the player, you'll want to add another effect item (using a base effect with a script archetype) to your object effect, and give it a condition using http://geck.gamesas.com/index.php/GetIsReference to check that it's running on the player. As pkleiss mentioned, you'll want to use http://geck.gamesas.com/index.php/ShowMessage to show your message. In order to use this function, you'll first need to create a new message form and give it content, then just pass its editorID to http://geck.gamesas.com/index.php/ShowMessage when you call it.

Cipscis

Thanks guys!
I will give that a shot