The main window of the program is used to display data. This can be split into a number of panes, each containing different choices of channels and types of display.
You can have a number of sessions open, but only the data for one is displayed at a time. A large toolbar window, called the session window, shows which sessions are open, one to a tab. The selected tab determines the data for the main window.
Another large toolbar window shows the current status of the cursor (i.e. where in the session the cursor is currently positioned), and details of the main window display.
The session and cursor windows can either be docked into the main window or can be floated off onto another area of the screen.