+20 flags
+24 Reserved
+28 Browser instance handle (provided by the browser)
+32 Parent window handle
+36 Left (bounding box
+40 Bottom in parent's
+44 Right work area
+48 Top co-ordinates)
+52 File type
+56 Filename (string_value)
This message is sent by the browser to create a plugin instance.
The file specified contains a series of parameters in the form of name-value pairs. This data is the list of attributes and parameters from the APPLET, OBJECT or EMBED tag - see their respective definitions. This data is used by the plugin to understand what is being requested of it.
If bit 0 of the flags word is set then this is a request to open the file as a helper appliation. i.e. external to the parent application. In this case the bounding box (offset bytes 35 to 51) are invalid. The parent window handle may be valid or 0 depending on how the file is launched.
Usually a plugin application will respond with Message_PlugIn_Opening.
PlugIn_Open flags
Bit Meaning if set
0 Open as a helper (otherwise as a plugin)
others reserved, must be 0
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