The ? button (What's This)
Click ? in the tool bar and the mouse cursor turns into a help cursor. The next click on any control opens the topic explaining it, and does not perform that control's normal action.
- Press
Escto leave help mode. Shift+F1does the same thing as clicking ?.- Clicking ? again turns the mode off.

The window that opens stays on the last topic; back and forward walk the topics you have looked at, and to Tutorial sends the same topic to the reading window if you would rather browse from there.

See also Import data, or read the Getting started tutorial from the beginning.