Scroll or drag down to push the plunger. How fast you push is how fast it goes in.
Walk: WASD or drag; hold Shift (or push the stick past its ring) to run. In first person, click the view to look
with the mouse (Esc frees it); on a phone, the left half of the screen walks and the right half looks.
Hands: Q or left click is the left hand, R or right click the right hand; a tap does the first thing listed. Shift+Q and Shift+R (or the ⋯ on a held-item tag) open the options wheel: arrows or 1-8 and Enter, Esc to close.
On a phone: tap a hand's tag, or long-press its button, for options. Hold a hand on the patient with both hands empty, for compressions. Hold E (or Pass, or a long press on a colleague) to pass what you hold.
C: your own eyes or the room view. L: lift it now. F: close-up. X: wipe your face. Scroll: push the plunger. Open the same ?room= link in another tab to play together.