Since there's no manual currently included in the GOG release, here's the basic controls (taken from the PC manual):

MOUSE:
Mouse = move cursor
Left mouse click = interact/take/use/talk
Right mouse click = examine
Both mouse buttons at once = inventory

KEYBOARD:
F1 = help
ESC = skip video/scene
Arrow keys = move cursor
CTRL+ALT = inventory
CTRL-X = quit game (no warning!)

SAVING/LOADING:
Use the typewriter in your office to save, load and quit.

Feel free to ask if you need anything else.

In the PC version my trackpad wont open inventory when i click both mouse buttons and similarly, in the mac version my mouse wont click both buttons for the inventory. for this reason, the game is unplayable.

For players that have an issue with pressing both mouse buttons to open inventory, here is an ahk script that replaces this dual-click with a press on Space bar.


#NoEnv ; Recommended for performance and compatibility with future AutoHotkey releases.
#Warn ; Enable warnings to assist with detecting common errors.
#SingleInstance force
; -----------------------------
; --- alternate hook method ---
#InstallKeybdHook
SendMode Event
SetKeyDelay, 30,50
; --- standard hook method ---
;SendMode Input ; Recommended for new scripts due to its superior speed and reliability.
; ----------------------------
SetWorkingDir %A_ScriptDir% ; Ensures a consistent starting directory.

GroupAdd, GameWin, ahk_class SDL_app ; window's game class
GroupAdd, GameWin, ahk_exe DOSBox.exe ; game exe

#IfWinActive DOSBox ahk_group GameWin
{
Space::
Send, {LButton down}{Rbutton down}
Sleep, 50
Send, {LButton up}{Rbutton up}
Return
}