Orders closed at market
What are the rules regarding closing orders at the market price?
-Are traders allowed to manually close orders?
-If not what happens when I close some of the orders manually?
-When I close orders manually I can see they are marked as "Closed at Market" in my profile->trade feed, but at the same time I can see other traders who have their orders closed at the price different from TP/SL and not marked as "Closed at Market". How is that achievable? Is it some kind of Backdoor left open, or it is absolutely legal way and those orders still count in final results?
Thanks for your answers.