The Wall – using the screen
R. Nigel Horspool, Nikolai Tillmann · Apress eBooks · 2013
A TouchDevelop script usually needs to interact with the user. While input via a microphone and output via speakers built into, or connected to, the device are certainly possibilities, a touchscreen or a screen plus a mouse is almost always used for input and output. In TouchDevelop, the screen is known as the wall. The API provides many ways in which a script can access the wall.