private static void assertFrontEndRunning() {
		if (tool == null) {
			throw new AssertException(
				"Cannot use " + AppInfo.class.getSimpleName() + " without a Front End running");
		}
	}
Class with static methods to maintain application info, e.g., a handle to the
tool that is the Ghidra Project Window, the user's name, etc.
Ghidra/Framework/Project/src/main/java/ghidra/framework/main/AppInfo.java