Walk throughout a level with mouse or numeric keypad (left diagram below)
or the Vi editor keys (right) or with a compact laptop setup (middle) that
requires enabling in config.ui.ini. Run until disturbed with Shift or Control.
Go-to with LMB (left mouse button). Run collectively via S-LMB (holding Shift).

               7 8 9          7 8 9          y k u
                \|/            \|/            \|/
               4-5-6          u-i-o          h-.-l
                /|\            /|\            /|\
               1 2 3          j k l          b j n

In aiming mode, the same keys (and mouse) move the x-hair (aiming crosshair).
Press `KP_5` (`5` on keypad) to wait, bracing for impact, which reduces any
damage taken and prevents displacement by foes. Press `S-KP_5` or `C-KP_5`
(the same key with Shift or Control) to lurk 0.1 of a turn, without bracing.
Displace enemies by running into them with Shift/Control or S-LMB. Search,
open, descend and attack by bumping into walls, doors, stairs and enemies.
The best melee weapon is automatically chosen from your equipment
and from among your body parts.