Hi,
I need to let user choose a specific path to run my node correctly and I think that preferences is the best way to do that. But where can I find the procedure to create these preferences for my node and to read it from my node ?
See e.g. http://help.eclipse.org/helios/topic/org.eclipse.platform.doc.isv/guide/preferences_prefs.htm
Or have a look at the source code of e.g. the CDK plugin (from the community contributions), which has its own preference page.