private void displayHelpUrl(Object help, URL helpUrl) {
		if (helpUrl == null) {
			Msg.debug(this, "Unable to find help for object: " + help);
		}

		helpUrl = validateUrl(helpUrl);

		if (hasBeenDisplayed && helpUrl.equals(mainHB.getCurrentURL())) {
			reloadPage(helpUrl);
			return;
		}

		mainHB.setCurrentURL(helpUrl);
	}
Returns the master help set (the one into which all other help sets are merged).
@return the help set
Ghidra/Framework/Docking/src/main/java/docking/help/HelpManager.java