If you have the Facebook app for Android/iPhone you already seen this type of slide in action. PageSlide is a jQuery plugin that allows you to accomplish this sort of slide on web pages. Basically, a plugin that slides a webpage over to reveal an additional interaction page.
The plugin itself is easy to implement and use, requiring only a line of code to make it work. PageSlide also offers a modal way of implementation displaying hidden content from the page itself without having to get content from another page. To understand this better, I invite you to check the demos.