This is a short summary of how special types are handled:

    'static' variables: Will not be saved at save_object(), nor modified at
    restore_object(). 'static' functions can not be called through
    call_other(). 'static' inheritance will make all inherited definitions
    'static'.

    'private' variables and functions: Can not be accessed by a sub class
    inheriting their definitions. Functions can not be called through
    call_other(). 'private' inheritance will make all variables and functions
    'private'. 

    'nomask' functions and variables can not be redefined by a sub class.
    'nomask' inheritance will make all inherited definitions 'nomask'.

    'public' variables and functions can be redefined by a sub class, even if
    they have been inherited 'private'ly. 'public' inheritance will make all
    inherited definitions 'public'. 

    The type 'protected' is reserved, but does not mean anything currently.