Arg can be either "on" or "off."

Use "on" to make the window stay on top. Use "off" to make the window return to normal.

This hotkey makes a window called "WOW1" always stay on top:

<hotkey F1>
    <SendPC local>
    <TargetWin WOW1>
    <AlwaysOnTop on>

This hotkey returns that window to normal:

<hotkey F2>
    <SendPC local>
    <TargetWin WOW1>
    <AlwaysOnTop off>