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Locals Buffer
This buffer displays the values of local variables of the current frame for simple data types (see Frame Info). Press <RET> or click mouse-2 on the value if you want to edit it.

Arrays and structures display their type only. With GDB 6.4 or later, you can examine the value of the local variable at point by typing <RET>, or with a mouse-2 click. With earlier versions of GDB, use <RET> or mouse-2 on the type description (‘[struct/union]’ or ‘[array]’). See Watch Expressions.

Registers Buffer
This buffer displays the values held by the registers (see Registers). Press <RET> or click mouse-2 on a register if you want to edit its value. With GDB 6.4 or later, recently changed register values display with font-lock-warning-face.
Assembler Buffer
The assembler buffer displays the current frame as machine code. An arrow points to the current instruction, and you can set and remove breakpoints as in a source buffer. Breakpoint icons also appear in the fringe or margin.
Memory Buffer
The memory buffer lets you examine sections of program memory (see Memory). Click mouse-1 on the appropriate part of the header line to change the starting address or number of data items that the buffer displays. Alternatively, use S or N respectively. Click mouse-3 on the header line to select the display format or unit size for these data items.

When gdb-many-windows is non-nil, the locals buffer shares its window with the registers buffer, just like breakpoints and threads buffers. To switch from one to the other, click with mouse-1 on the relevant button in the header line.