+20 Flag bits:
0: Set; return a Message_PlugIn_Notify message on completion
1: Set; POST to the URL
Clear; GET from the URL
If bit 1 is set :
2: Set; POST a file
Clear; POST a block of memory
Bits 3-31: reserved (must be zero)
+24 PlugIn instance handle
+28 Browser instance handle
+32 URL to access (string_value)
+36 Window target (string_value), or 0 to return to the plugin.
+40 Notify data to be returned
+44 Length of data to be POSTed
+48 If bit 2 is set; filename (string_value)
If bit 2 is clear; pointer to data (string_value)
This message is sent to a browser to perform various actions on a URL.
If the window target is "" then the URL is fetched to the window containing the plugin. If the window target is "<anything>" then it will be fetched to the given window name. If the target value is actually 0 then a stream is opened and data is sent to the plugin.
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