Here some documentation about internal pd messages.
(pd-msg_05)

1) Thoses msg are sent directly to pd (pd selector) or to a loaded patch (pd-patch.pd selector).
  all thoses msg has to be finnished by a ";"
  you can test them using :
    in the file menu : message
    pdsend
    the tclsend2pd in the 4.msg_from_tcl folder.

  Thoses message allows you (examples):
    To control pd without the gui :
      Take benefit of the no-gui option
        open a patch via socket... (tcl, python, sh, c++,...)
        modify or create new patch
      Create patch that will create some other
        Deals with massive polyphonie (100 osc~ or more...)
        load patchs from an other
        construct generative patch
      Create new gui
    etc...

2) Here an list of those msg (* are documented somewhere in this doc):

  messages to pd:
        init  [gimme]
        filename  [symbol] [symbol]
    *   open  [symbol] [symbol]
    *   quit
        foo  [gimme]
    *   dsp  [gimme]
        meters  [float]
        key  [gimme]
    *   audiostatus
        finderror
        ping

 messages to canvas:
    *    obj  [gimme]
    *    msg  [gimme]
    *    floatatom  [gimme]
    *    symbolatom  [gimme]
    *    text  [gimme]
    *    graph  [gimme]
    *    array
    *    scalar  [gimme]
        bng  [gimme]
        toggle  [gimme]
        vslider  [gimme]
        hslider  [gimme]
        radio  [gimme]
        vumeter  [gimme]
        mycnv  [gimme]
    *    connect  [float] [float] [float] [float]
    *    restore  [gimme]
        write  [symbol] [defsymbol]
        read  [symbol] [defsymbol]
        mergefile  [symbol] [defsymbol]
        sort
    *    click  [float] [float] [float] [float]
    *    mouseup  [float] [float] [float]
    *    key  [gimme]
    *    motion  [float] [float] [float]
    *    print  [symbol]
    *    menusave
    *    menusaveas
    *    menuclose  [deffloat]
    *    saveto  [symbol] [symbol]
    *    cut
    *    copy
    *    paste
    *    duplicate
    *    selectall
    *    tidy
    *    texteditor
    *    editmode  [deffloat]
        protectmode  [deffloat]
    *    print  [symbol]
    *    pop  [deffloat]
    *    loadbang
    *    relocate  [symbol] [symbol]
    *    menufont
    *    font  [float] [float] [float]
    *    find  [gimme]
    *    findagain
    *    findparent
    *    vis  [float]
        properties  [float] [float]
        help  [float] [float]
        arraydialog  [symbol] [float] [float] [float]
        map  [float]
        clear
        intatom  [gimme]
        atom  [gimme]



3) Here the map of the documentation :
  1.msg_and_patch
    describe msg that can be sent to patch.
    contains pd files

  2.msg_and_pd
    describe msg that can be sent to pd.
    contains pd files  

  3.pdscript 
    it's sh scrip using pdsend to create patch into pd.
    pdscript has been done by Guenter Geiger
    contains it's own readme + files.

  4.msg_from_tcl/tk
    decribe how to use tcl/tk to create, open patch, etc...
  
  5.Examples
    Contain an example of how a "obj x y myOsc~" message can be use
    to deal with massive polyphonie

4) Releases :

  release 0.5 : pd-msg_05.tar.gz
    add some more msg.
    Thanks to Krzysztof Czaja
    all msg are listed for pd0.34

  release 0.4 : pd-msg_04.tar.gz
    add many message :
      the events messages
      the menu messages
      the cut&paste msg, etc...
    complete the polyphonie example
  
  release 0.3 : pd-msg
    Rearenge patch & examples in diferents directory.
    add polyphonie examples
    add tcl scripts...

  release 0.2 : self-generation
    add messages to open and close patch.

  release 0.1 : self-construction
    first release

5) To do list :

  some msg are not well explain or not explain at all.

6) Reference :
  Look @ the end of code of g_canvas.c in the source directory.


Damien HENRY