Originally Posted by psycore

Yes, they are called "hooks".
Works like this:

add_hook("<hook_name>", "[identifier]", <function to be executed>)

for keyboard intput there are the hooks, "key_down" and "key_up". The function you provide has to take one argument, the key that got pressed. Example:

local function echoKeyCode(key)
  echo(key)
end

add_hook("key_down", "echoTheDamnKeyCode", echoKeyCode) --notice the missing brackets after  echoKeyCode

This will simply echo the key code of the key pressed.
In addition to that there is the function get_shift_key_state() which propably returns true if shift is pressed.

For mouse input there are "mouse_button_up", "mouse_button_down" and "mouse_move".

Functions for "mouse_button_up" and "mouse_button_down" have to take 3 arguments:

local function onButtenUp(mouseButton, x, y) --mouseButton: 1=left, 2=wheel, 3=right
  [...]
end
add_hook([...])

Whereas mouse_move just takes x and y.

There are also "bout_mouse_down", "bout_mouse_up", "bout_mouse_over", "bout_mouse_outside", "spec_mouse_down", "spec_mouse_up", "spec_mouse_over" and
"spec_mouse_outside" but they are not really needed.

Originally Posted by legsol

Add "ls <scriptname.lua>" to profile.tbs in your Toribash root directory (typically CGames\Toribash-version\) to autoload the script.
DeScript would load scripts for you, but I think there are a few compatibility issues and DeFransen is banned, so it's unlikely to be updated soon.