how does targets work?

Pasted by karlp on Wed Aug 2 20:49:50 2023 UTC as Text only 
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0x00005586 in ?? ()
(gdb) x 0xE000ED00
0xe000ed00:	0x721cd200
(gdb) mon targets
    TargetName         Type       Endian TapName            State       
--  ------------------ ---------- ------ ------------------ ------------
 0* rtl8720dn.cpu.km0  cortex_m   little rtl8720dn.cpu      halted
 1  rtl8720dn.cpu.km4  cortex_m   little rtl8720dn.cpu      halted
(gdb) mon targets rtl8720dn.cpu.km4 
(gdb) x 0xE000ED00
0xe000ed00:	0x721cd200
(gdb) mon targets
    TargetName         Type       Endian TapName            State       
--  ------------------ ---------- ------ ------------------ ------------
 0  rtl8720dn.cpu.km0  cortex_m   little rtl8720dn.cpu      halted
 1* rtl8720dn.cpu.km4  cortex_m   little rtl8720dn.cpu      halted
(gdb)