in reply to How I Summoned the Planes

I don't understand the curly brackets
{ my @command = ($0,@ARGV); $Window->command(?@command?); }
What do you suppose that does? Is it an artifact of Tcl code? Neither could I find where command and group are inherited from. But, simply including in the initWindow subroutine:
#... sub initWindow { print STDERR "Initializing Tk window...\n" if ($opt_debug); $Window = MainWindow->new(-title => "Perlmonks Chat"); $Window->group($Window); #... ^^^^^^
is enough to create a WindowMaker icon. Like you, I'm not comfortable that something works, when I don't know why it works - maybe it's not working the way I imagine.

What's the best way to research inheritance in an Object Oriented program? How do I know I've found the attributes that are inherited?

I found this concerning Tk::Wm.
And the following descriptions.

        If value is specified, this method stores value in $toplevel's
        WM_COMMAND property for use by the window manager or session
        manager and returns an empty string. Value must have proper list
        structure; the elements should contain the words of the command
        used to invoke the application. If value isn't specified then the
        method returns the last value set in a command method for
        $toplevel. If value is specified as an empty string, the method
        deletes the WM_COMMAND property from $toplevel. 

        If $widget is specified, it is the the leader of a group of related
        windows. The window manager may use this information, for example,
        to unmap all of the windows in a group when the group's leader is
        iconified. $widget may be specified as an empty string to remove
        $toplevel from any group association. If $widget is specified then
        the method returns an empty string; otherwise it returns the
        $toplevel's current group leader, or an empty string if $toplevel
        isn't part of any group. 

That helps a bit. But I'm not sure that I understand the relationship in the Object hierarchy, even for all that.