It is just a program to take screenshots of the current Active Window. It saves them to disk right away. To take screenshots, simply click on 'START Capture' or Left-Click the TRAY ICON. If it becomes animated it means it's on capture mode. During capture, the right-mouse button will NOT work, as it will be taking screenshots, until you LEFT-CLICK the TRAY ICON again, which will stop the capture mode.
You can also right-click the start button or tray icon to crop a capture of the entire screen. Hold down the left button while cropping.
Some of the latest updates are aimed mainly at watching anime or any videos with MPC (K-Lite's Media Player Classic)