Once a program is running, the Processes and Threads view displays information about all of the processes and threads running in your program. The attributes list at the bottom lets you choose which information to display, and in what order. By manipulating these attributes you can create various views into your program.
One line is bold, indicating the process and thread that currently has the focus. You can double-click on a different line to change the focus to that process and thread. The thread of focus determines the data displayed in the Call Stack and Data View.