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Specifying a Debugging Target
A target is the execution environment occupied by your program.
Often, GDB runs in the same host environment as your program; in that case, the debugging target is specified as a side effect when you use the
core commands. When you need more flexibility--for example, running GDB on a physically separate host, or controlling a standalone system over a serial port or a realtime system over a TCP/IP connection--you can use the
target command to specify one of the target types configured for GDB (Commands for managing targets).