Space picks a character up or puts it down. Arrow keys move it; hold Shift for bigger steps. Enter shows its meaning. S takes a combined character apart. Escape puts it back. When nothing is held, arrow keys move the view. Plus and minus zoom; zero shows everything. Number keys go to a section: 1 Repetition, 2 Pairings, 3 Changing shape at the side, 4 Changing shape on top, 5 Inside, 6 Taking apart. The map in the lower right shows the whole page; choose a spot to go there. Page Up and Page Down, or the bracket keys, go to the previous or next section.