When play begins 
        (consider the scene changing rules)
Every turn 
        when in the waiting area and a random chance of 1 in 2 succeeds  
        (if the bratty girl is in a room (called the current room) and a random chance of 1 in 3 succeeds begin; ...) 
When play ends 

Reaching inside 
        can't reach inside rooms rule
        can't reach inside closed containers rule
Reaching outside 
        can't reach outside closed containers rule

Making new rulebooks 

Before, instead of and after actions

Before 
        going to the foyer for the first time  

Instead of 
        waiting in the Parking Lot  
        going nowhere from the Parking Lot  
        going nowhere from the foyer  
        going nowhere from the waiting area  
        showing anything that is not the amulet to Bob when the player is not Bob  
        showing the amulet to a player-character (called the posessed)  
        examining the amulet for the fourth time  
        examining the amulet for the third time  
        kissing Bob when the player is not Bob  
        doing anything other than examining to the photographer  
        examining the photographer  

After 

Rules for checking, carrying out and reporting on actions can be found in the Actions index. Summary of action rules 

Before, for and after activities

Printing the name 
    before     a thing (called XXXX)
Listing contents 
Grouping together 
Constructing the status line 
Listing nondescript items 
Deciding the scope 
Supplying a missing noun 
    for         while smelling ambient odour rule
    for         while listening ambient sound rule
    for         while going block vaguely going rule
Supplying a missing second noun 
Reading a command 
Deciding whether all includes 
Printing the player's obituary 
    for         print obituary headline rule
    for         print final score rule
    for         display final status line rule
Amusing a victorious player 
Printing the banner text 
Printing the plural name 
Deciding the concealed possessions 
Printing a refusal to act in the dark 
Printing the announcement of darkness 
Printing the name of a dark room 
Printing the description of a dark room 
Printing room description details 
Printing a parser error 
Implicitly taking 
Starting the virtual machine 
Writing a paragraph about 

What are activities?  How extensions can make new activities