Timeline view (Tasks): When an item is selected

 Select the previous item (The left Arrow key )

Select the next item (The Right Arrow key )

Select multiple adjacent items (Shift + Left Arrow or Shift + Right Arrow )

Select multiple non adjacent items (Ctrl + Left Arrow + Spacebar or Ctrl +Right Arrow + Spacebar )

Open the selected items (Enter)

Select the first itemon the timeline (If items are not grouped ) or the first item in the group (Home )

Select the last item on the timeline (if items are not grouped ) or the last item in the group (End )

Display (without selecting ) the first item on the timeline (if items are not grouped ) or the first item in the group (Ctrl + Home)

Displays (without selecting ) the last item on the timeline (if items are not grouped ) or the last item in the group (Ctrl + End )