The breakpoints buffer shows the existing breakpoints, watchpoints and catchpoints (see). It has these special commands, which mostly apply to the current breakpoint, the breakpoint which point is on.
gdb-toggle-breakpoint). On a graphical display, this changes the color of a bullet in the margin of a source buffer at the relevant line. This is red when the breakpoint is enabled and grey when it is disabled. Text-only terminals correspondingly display a ‘B’ or ‘b’.
gdb-many-windows is non-
nil, the breakpoints buffer
shares its window with the threads buffer. To switch from one to the
other click with Mouse-1 on the relevant button in the header