> When the system detects a touch display, the virtual keyboard automatically displays at the bottom of the screen whenever it is possible to enter text. The keyboard also automatically hides when no text entry is possible.

> This auto show and hide should work with most applications, but it isn’t supported by everything. For applications which do not support it, you can instead use the keyboard icon at the right end of the taskbar to manually toggle the keyboard on and off.

The first one seems to require support from the app, the second one is provided by the OS and works for every app. I was referring to the first one.