SjBoy Emulator is a PC software to run java application on your PC. Mostly, java application is used for mobile phone and and mobile gadget. If, you want to run those application on your PC, you need SjBoy Emulator to run Java application properly. There are many of java emulator in internet but my favorite is SjBoy. It's a simple and lite software but running well. I used to use SjBoy to run Mig33 application. It's a mobile chatting software. You can download SjBoy here. It's free!