Imagine you have a switch with 230 checks and for some reason you change the switch IP address. The modules monitoring it would stop working unless you change the IP address in the Main Agent view. If the number of modules affected is a little high, though, most likely you would like to change the IP address on all the remote checks at once.
Change the IP address of the agent manually and alter the module configuration at once using the SQL Manager and the following SQL sentence:
UPDATE tagente_modulo SET ip_target = "10.0.0.1" WHERE id_target = "10.0.0.2";
10.0.0.1 would be the new IP address, and
10.0.0.2 the old one.