+12 my_ref field from Message_PlugIn_Open
+20 flags
+24 PlugIn instance handle (invented by the PlugIn)
+28 Browser instance handle (copied from Message_PlugIn_Open)
This message is sent by a plugin application in response to a PlugIn_Open request.
Note: You may open as a helper, even if the browser requested an embeded window.
PlugIn_Opening flags
Bit Meaning if set
0 plugin can accept input focus (otherwise it cannot)
1 plugin wants code resources fetched (otherwise it will fetch code itself)
2 plugin wants data resources fetched (otherwise it will fetch data itself)
3 plugin will delete the parameter file itself (otherwise the parent should)
4 plugin has more work to do, keep showing busy indicator (otherwise it is loaded)
5 plugin understands PlugIn_Action message beyond the stop reason code (otherwise only stop is understood)
6 plugin task has opened a helper window (otherwise plugin has embedded itself)
others reserved, must be zero
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