If you are giving a presentation it can be easier to present CommCare using a tool on your computer. This is also sometimes useful for testing your application. There are several ways to do this.
The CommCareHQ Emulator: When you go to "deploy" on your application you will see an option for "Preview in Emulator." You must have Java installed and it will take several minutes to load, but will give a good approximation to how the app will look like on a J2ME/Java/NOKIA-style phone.
Demo CommCare ODK for Android using BlueStacks -easy to install but not suitable for non-English apps. Also only works in horizontal orientation
Demo CommCare for Android using Droid@Screen - harder to install but better for non-English languages and showing screens in a vertical orientation