android -- question about singleTask mode

after looking up the 'Defining launch modes' section of the 'Tasks and Back Stack' guide , I dont understand exactly the behavior of an activity declared with "singleTask".

assume that I start a singleTask-activity (via startActivity method ) when there is an instance of that activity laying at the bottom(root activity) of a background task,

as the article describes, the Intent I use to start singleTask-activity will be delivered to the instance, in this case, does the instance bring itself to top of its task and its task to foreground, or just bring its task to foreground without bringing itself to top of its task?

Do I make myself clear? pls help! thanks in advance