The paper doll programs themselves come in several formats, such as Flash games that can be played on a Web browser, or full programs that must be installed onto the user's computer before it may be used.
Either way, expect Changing Clothes Is a Free Action. When it's not a game, it could be for avatars in online communities. This is often a way to customize the character, even if it's just a cosmetic feature.
Any time a video game or computer program that lets you change clothes a character is wearing, which usually requires just changing the graphics, so it's like changing the clothes on a paper doll.
