While using various applications on Samsung Galaxy Tab 2, such as Gallery, when you touch Share to share a file, you see Group Cast as an option.
Group Cast is an easy way to share files in real time with others who are on the same Wi-Fi network. Group Cast can be used when you want to share documents, images, music, and so on.
You can use Group Cast for meetings, sales presentations, conferences, and classes. All you need is a Wi-Fi network that works with Group Cast, and most do.
Note: After the initial Group Cast request, touch Group Cast instead of Share.
Note: The newly altered image (with markups and comments) can not be saved, but you can take a screen shot of the current image and save it to your Clipboard. For more information, refer to How to take a Screenshot on Samsung Galaxy Tab 2.
This article will work on both Samsung Galaxy Tabs; including Samsung Galaxy Tab 2 7.0 and Samsung Galaxy Tab 2 10.1.