ConfigurePlugin notes

Plugin system classes (used in PluginQuit, PluginQuitAbort and
PluginQuitContinue) :

&50DBF = Top level configure plugins
&50DBE = Boot configure plugins
&50DBD = Font configure plugins
&50DBC = Network configure plugins
&50DBB = Sound configure plugins
&50DBA = Disc configure plugins
&50DB9 = Screen configure plugins
&50DB8 = Applications configuration plugins (allocated, but not requested)
&50DB7 = Extensions configuration plugins 
&50DB6 = System tools
&50DB5 = Windows configure plugins
&50DB4 = User configure plugins

&000-&100 = private use, non-distribution (test) plugins

[need XML conversion of original documentation of protocol]
