Adobe After Effects CS5 Compositions and the work area (keyboard shortcuts) keyboard shortcuts keys

Shortcut                                                        Command
Ctrl+N	New composition
Ctrl+K	Open Composition Settings dialog box for selected composition
B or N	Set beginning or end of work area to current time
Ctrl+Alt+B	Set work area to duration of selected layers or, if no layers are selected, set work area to composition duration
Tap Shft	Open Composition Mini-Flowchart for active composition
Shft+Esc	Activate the most recently active composition that is in the same composition hierarchy (network of nested compositions) as the currently active composition