TASKSHARING
PF-PM or CM1-CM2: each pilot independently performs the task but not necessarily at the same time.
BOTH: both pilots perform the task together, but one can perform on behalf of the other, but need to be coordinated and information shared,During PF FMS PREP, PM is normally performing the EXTERIOR
WALKAROUND, upon return he crosscheck the FMS.
Both Flight Crewmember SEATED, applies from checking the GLARESHIELD and Lateral Console.