QuickTime editor

Select keyframe of the upper/lower tracks and samples displayed in the Timeline window	or
In the Track Content Area, select previous/next sample	or
In the Track Content Area, select upper/lower sample or track	or
In the Track List Area, select upper/lower track	or
In the Track Ruler Area, step forward/backward	or
Drag & copy sample/track	Ctrl -drag in the Content/List Area
Create keyframe sample of a sprite	Ctrl -click
Select next time marker	+ or
Open/close tracks, subtracks	Ctrl + or
Scale sample time	-drag
Jump to start/end of movie in timeline	Ctrl + or

Shift Key