Eclipse preferences - ISISComputingGroup/ibex_developers_manual GitHub Wiki
There are two sorts of settings.
System.getProperty("x") will read a setting supplied on the command line as -Dx=value. To set in Eclipse go to "Run/Run Configurations..." and add to the "VM arguments" on the Arguments tab
The second sort are Eclipse preferences. On the plugin's extensions tab under "org.eclipse.core.runtime.products/???? (product)" there should be a preferenceCustomization proper whose value is the name of the preferences file. In that file set a property like:
org.csstudio.isis.product/prefix = NDW1298:sjb99183:
To access it from org.csstudio.isis.product:
prefix = DefaultScope.INSTANCE.getNode(Activator.PLUGIN_ID).get("prefix", "no found");