How do I hide my e-mail as a dock?

[boydwgrossii]

I saw a video on YouTube where a guy moused over the left side of his OS and he had a dock that popped out that was just his e-mail. He had the bottom dock too and I wanted to do the same with my e-mail.

Does anyone know how to do this?

 

[BrianBaughn]

It would help if you posted a link to the YouTube video.