A new project is created using Project ⇒ New.... This opens a Dialog in which the name of the project, the directory, descriptions and comments as well as the directory for the default files (see 2.4) can be entered. The new project is entered in the project tree navigator, and set as the active project.
If an existing project is opened (Project ⇒ Open...) this will likewise be set in the project tree navigator and marked as the active project.
The currently selected project is closed using the Action Project ⇒ Close. This Action can also be found in the context menu (see 1.1) of the project tree.