I'm putting hardwood in my upstairs.  I'm starting in my master bedroom then transitioning to the hallway and finally to the other bedrooms.  My question is: What is the best way to transition between rooms and still hold the board lines between rooms and to the stair nose piece? 

I do not want to use a transition piece to cross from room to room.  I want the boards to go continuous from room to room through the hallway.  I will need to reverse the direction of the tongue of the boards to change the direction the floor is being laid.  I'm assumming that I will need to mate a groove to groove on the row of boards when I reverse the tongue.  I'm wondering if this is done using a special process or maybe a tongue insert into the groove. 

Thanks