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Properties (on root window only)

see  http://standards.freedesktop.org/wm-spec/1.3/ar01s03.html

See them in
  xprop -root

_NET_ACTIVE_WINDOW(WINDOW)
    Currently active window.  Not necessarily the window with focus.

        xprop -root _NET_ACTIVE_WINDOW
        _NET_ACTIVE_WINDOW(WINDOW): window id # 0x3c00022

    Also see WindowID.hints

_NET_WM_STATE_DEMANDS_ATTENTION(WINDOW)
    Is some window demanding attention from the user?

_NET_CURRENT_DESKTOP(CARDINAL)

_NET_NUMBER_OF_DESKTOPS(CARDINAL)

_NET_DESKTOP_NAMES(UFT8_STRING)  null terminated strings x num_desktops

_NET_DESKTOP_GEOMETRY(CARDINAL) = WIDTH, HEIGHT of display

     xprop -root _NET_DESKTOP_GEOMETRY

_NET_WORKAREA(CARDINAL) = { X,Y, WIDTH, HEIGHT },...
  The screen area minus the reserved 'margins' set by the window manager,
  repeated for each of the desktops.  Clients that maximize windows should
  only use this area.

_NET_WM_STRUT_PARTIAL = { left, right, top, bottom,
       left_start_y, left_end_y, right_start_y, right_end_y,
       top_start_x, top_end_x, bottom_start_x, bottom_end_x }
  reserve space at borders of desktop.
  In root coordinates, clients may change,
  window_manager does not set this but adjusts WORKAREA to match

_NET_FRAME_EXTENTS = left right top bottom
  size of the window manager decorative frame on this window

_NET_CLIENT_LIST(WINDOW)
  list of window IDs tha the windo manager supports

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Properties (per window)

_NET_FRAME_EXTENTS(CARDINAL)

    How much border and other decorations does a window manager add
    around a application window.

        xprop -id $WINDOWID _NET_FRAME_EXTENTS
        _NET_FRAME_EXTENTS(CARDINAL) = 2, 2, 26, 7

    Order:  Left, Right, Top, Bottom

_NET_WM_DESKTOP(CARDINAL)     Desktop it is on

WM_COMMAND(STRING)   = "xterm", "-g", "80x16+65+891", "-ls"
WM_CLIENT_MACHINE(STRING) = "kirin"        (hostname command was run on)
WM_CLASS(STRING)     = "xterm", "XTerm"    (instance and application class)
WM_NAME(STRING)      = "anthony@kirin:~"   (actual titlebar of window)
WM_ICON_NAME(STRING) = "anthony@kirin:~"

Standard Properities for a Client

                      X Command Argument             xdotool search option
   Class               (not settable)                   --class
   Class Instance      -name                            --classname
   Window Title        -title                           --name
   Icon Title          -n                               --iconname

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Application Properities

Get the running PID of the widnow process...

   xprop -name parcellite -notype _NET_WM_PID

Setting and changing Properities

String Properity...
    xprop -id $win_id -f PROP 8s \
          -set PROP "String to set"

Integer (Cardinal) Properity

  Change Desktop of a Window...
    xprop -id $win_id -f _NET_WM_DESKTOP 32c \
          -set _NET_WM_DESKTOP 2

  The workspace manager shows change, but window is not moved.
  However iconising window changes icon manager!
  though openbox de-iconizes to original desktop!
  Basically panel and openbox get out-of-sync!

Atom Properity

  Set state above - does not always work
    xprop -id $win_id -f _NET_WM_STATE 32a \
          -set _NET_WM_STATE _NET_WM_STATE_ABOVE

  Don't list window in Taskbar - works
    xprop -name Transmission -f _NET_WM_STATE 32a \
          -set _NET_WM_STATE _NET_WM_STATE_SKIP_TASKBAR

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