Jack in

The action of Jacking-in is when a net operator sends his or her NetNavi into the cyber world. In Mega Man Battle Network 1, 2, and 3, the PET contained a wire that plugged into the jack of an electrical unit. From Mega Man Battle Network 4 on, all Navis jacked in by wireless transport. To jack-in with MegaMan.EXE in the games, Lan would have to be standing considerable close to the jack-in port. The act of "Jacking-out" is the opposite operation.

When a Navi is in the cyber world, their operators can disconnect without jacking them out but they cannot send Battle Chips to their Navi without connection. Also, if a Navi loses its connection with its operator, the Navi can only jack-out by manually returning to the original jack-in site.

In Mega Man Battle Network 2, Lan receives a wireless port adapter before leaving to Netopia. Fortunately for him, he is able to attach it to two ports; one that became out of reach due to a trap and the other that was too far to reach without going near Princess Pride. The wireless allows MegaMan to jack-in through the wireless field. The wireless is essentially the predecessor to the wireless PET's introduced in Mega Man Battle Network 4.

In the Japanese version of both the game and anime, the phrase is "Plug-in..." Netto is also the only one who includes ".EXE" whenever he plugs in.

Notable Quotes
Most net operators call a sort of battle cry before jacking-in their NetNavi by yelling out their Navi's name.
 * Lan Hikari: "Jack-in! MegaMan.EXE transmit" (MegaMan Battle Network)