NeptuneLabs FSI Viewer JS User Manual page 244

Providing plug-in parameters via HTTP query
fsi.swf?navextension_visible=true&history_length=10
The example above sets the "visible" parameter of the "NavExtension" plug-in
to "true" and the "length" parameter of the "History" plug-in to "10".
Similar to providing plug- in parameters you can provide plug-in parameters in
the options section of FSI Viewer configuration files by prefixing the parameter
name with the name of the plug-in. This way you can specify plug-in parameters
without actually including the plug-in again.
Providing plug-in parameters as global parameters
<Options>
...
<history_length value="10" />
...
<Options>
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