3 screenlock \- disable access to a terminal
8 grabs the screen, keyboard, and mouse devices
9 to disable access to the Plan 9 terminal on which it is run.
10 The screen can be unlocked by typing the invoking user's Plan 9 password
16 the image displayed while the terminal is locked
18 .B /sys/src/cmd/screenlock.c
20 Use of this program on communal terminals is anti-social.