private Map<ResourceFile, Set<URL>> mapHelpToModule(Collection<ResourceFile> moduleRoots,
			Set<URL> allHelpSets) {

		Map<ResourceFile, Set<URL>> results = new HashMap<>();
		for (ResourceFile module : moduleRoots) {
			String moduleName = module.getName();

			Set<URL> help = new HashSet<>();

			Iterator<URL> it = allHelpSets.iterator();
			while (it.hasNext()) {
				URL url = it.next();
				String asString = url.toExternalForm();
				if (asString.contains(moduleName)) {
					it.remove();
					help.add(url);
				}
			}

			if (!help.isEmpty()) {
				results.put(module, help);
			}
		}

		return results;
	}
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