Walk throughout a level with mouse or numeric keypad (left diagram below),
or with its compact laptop replacement (middle) or the Vi editor keys (right)
selectable 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.