Valid contexts are 'R' for the root window, 'W' for an application window, 'D' for a desktop application (as kdesktop or Nautilus desktop), 'T' for a window title-bar, 'S' for a window side, top, or bottom bar, '[', ']', '-' and '_' for the left, right, top or bottom side only, 'F' for a window frame (the corners), '<', '^', '>' and 'v' for the top left, top right, bottom right or bottom left corner, 'I' for an Icon window, or '0' through '9' for title-bar buttons, or any combination of these letters. 'A' is for any context. For instance, a context of "FST" applies when the mouse is anywhere in a window's border except the title-bar buttons. Only 'S' and 'W' are valid for an undecorated window.
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