Transaction Group Trigger Evaluation on Tag Change

It's possible for a transcation group to evaluate a trigger when a Local tag Provider tag changes ?

Please explain further (actual details). Transaction groups can be triggered directly upon tag change. Transaction groups can also have "Run Always" expression items that are then used as the trigger.

Hi Phil,
Thanks for your quick answer and sorry for my late reply.
You are right, It has been a mistake of mine in understanding the transaction groups.
Thanks for your help.