Domes can be moved in either order (right hand first or left hand first) or simultaneously. It’s the position of the domes in their respective 8 positions that types the character. The domes do not have to be re-centered to type subsequent characters. Holding the left dome in one of its positions allows the typist to type 8 characters using the right dome. If one or more of the characters you wish to type are in that left hand position, you can hold the dome there to type the characters.