In the command reference, all commands are listed with a command matrix.
This is a cross-reference table, showing the availability of commands in
various modes. The table looks like this:

Command Type / Mode    Command Mode Overstrike Mode Insert Mode

Immediate command           -             -               * 
Line-editing command        -             *               * 
Interrupt command           -             -               * 


If the command exists as a single command, an extra section is added
showing the argument types accepted:

                        Parameters:
Single command          None    :  - 
                        Argument:  - 
                        Range   :  * 
                        List    :  - 

Two extra sections give an overview of error/information message conditions:

                        Errors:
                        General Messages    
                        Specific Messages