private static URL findMasterHelpSetUrl() {

		GHelpClassLoader helpClassLoader = new GHelpClassLoader(null);
		URL url = HelpSet.findHelpSet(helpClassLoader, MASTER_HELP_SET_HS);
		if (url != null) {
			return url;
		}

		Msg.error(GhidraHelpService.class,
			"Failed to locate the primary Help Set.  Try building help to resolve the issue");
		return ResourceManager.getResource("help/" + HelpService.DUMMY_HELP_SET_NAME);
	}
The hardcoded value to use for all HelpSet 'home id' values.  Subclasses may change this 
value by overriding {@link #getHomeId()}.
Ghidra/Features/Base/src/main/java/ghidra/base/help/GhidraHelpService.java