"Tap System" terminology is easily confused....
Taps are the devices that connect to your keg. Some come in pairs like corni kegs, and some are built into one "tap" like sanke.
Lines are the actual hoses that connect your CO2 bottle to the gas tap/keg, and the beer tap/keg to the shank/faucet assembly.
Shanks are what your beer lines connect to on one side, and your faucet screws into the shank on the other side (outside). Its an intermediary for flexibility in installation (they come in many lengths including elbow shanks for tight installs (draft towers) , and allows the faucets to be quickly removed for cleaning.
Faucets are the actual "spickets" where the beer comes out. This is commonly (and incorrectly) called a "tap" which is where the confusion stems from.
So when I say we are switching taps, that just means you are switching the keg connectors at the keg. The faucets remain in place.