The main window is shown below.
A session is defined as a request and response pair. Request message shows in the left pane and response message shows in the right pane.
Selecting an item in the session grid causes the lower part of the HTTP Monitor window to display detailed information about that item. The size of this region can be adjust by dragging the splitter that separates it from the session grid and you can maximize the session view by clicking the Hot Zone of the splitter. For more information see Session View.