+20 Flag bits:
0: Set; PlugIn is busy
Clear; PlugIn is not busy
1: Set; state at R1+32 has some meaning
Clear; ignore word at R1+32
2-31: reserved (must be zero)
+24 PlugIn instance handle
+28 Browser instance handle
+32 State:
0: Stop
1: Play
2: Pause
3: Fast Forward
4: Rewind
5: Record
Requests that the parent display some indication of business (e.g. spinning logo, etc.). If the plugin has set the busy bit in its PlugIn_Opening message then it should send this message with bit 0 clear when it has finished its loading.
This is also used to notify the parent of any state change by the plugin in case it needs to update any user interface.
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