Have + EN
The situation is both present AND Past
The situation is over but it has consequences.
The situation described is true in the present but it was also true in the past. In other words, it is not over. The important point is that the speaker considers that the situation is different now from what it was before.
simple form
I have lived in Paris for 6 months.
I have lived in Paris since December.
(living in Paris is both a present and past situation)
noticing
Look! Someone has broken the window!
They have finished building this house.
continuous form It has been raining all morning.
I have been working for 2 hours!
assessing I have never been to Mexico.
They have invited us many times before.
Remember: FOR indicates the time span between the beginning of the situation and now. SINCE indicates the point when the situation started.
Examples: you can see the result of a past action; you realize that the situation has changed; you can count the number of times something has happened, etc.

Have + EN always indicates a link between the present and the past.

Either the action is not over or I consider the result of past actions.