[shell-coding] Shell_TrayWnd: unusual WM_COPYDATA messages

Hey all,

I've noticed something odd (seemed odd to me at least) when debugging LiteStep's TrayService:
As you know WM_COPYDATA is sent to the "tray" window on several occasions. The "dwData" member of the COPYDATASTRUCT tells us what kind of message we just received. If it equals 1 it's a tray message from Shell_NotifyIcon, if it equals 0 it's an appbar message from SHAppBarMessage. So I'm stating the obvious here. But today I saw messages with dwData set to 2. cbData was 20 in those cases. Those are new to me. The messages occured when launching iexplore.exe (each and every time). Can anyone confirm this? Does anyone have any idea what kind of messages they are?

Simon



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