Well, an HTML browser probably just means it will generate images and styles to a website, to make it look as it usually does. The reason I say that is because they usually just call it an Internet browser to browse the world wide web. The difference is you won't be able to do certain things such as search, enter stuff in forms, or create Yahoo answer question, making the world wide web a place to only see and not do anything. This also means not being able to login..
But I could be wrong, it's just my guess..
As for alias 2, i'm not familiar with it. But if it says it has an "HTML Browser" I'll bet it's what I just stated above.