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If this is not present the directory in the global.properties defined by the INFORMATION_PANEL_FOLDER property will be used.
Within these directories each node has its own directory. The directory should have the same name as the node id.
Within that directory the documentation for that node can be placed.
Below an example of the tool window forecaster help. In this example the forecaster has two documents available for information.
If multiple directories are configured this window will show all available files for the node from the different predefind directories together.
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