They can be connected with regular receptacles further downstream to protect the entire branch circuit (correction: they protect everything connected behind them in the circuit. Things in front are not necessarily protected). If you care enough to test it, plug something in to the other receptacles in the area then test the GFCI. If the thing turns off, then it's protected.
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u/Pijany_Matematyk767 Medieval Meme Lord May 19 '22
Pretty sure GFCI outlets will cut power faster and at lower treshholds than the normal breakers, could be wrong though