The company has 'plugged into' the international market. [=the company has become connected to the international market; the company has begun to do business in the international market]
His friends are 'plugged into' the city's music scene. [=his friends are actively involved in the city's music scene]
The computer program will take data from these sources and automatically 'plug' it 'into' the equation.
(..) How can you possibly know about the drinking? Shot in the dark. Good one, though. Power connection - tiny little scuff marks round the edge. Every night he plugs it in to charge, but his hands are shaking. You never see those marks on a sober man's phone, never see a drunk's without them. (..)2010 TvShow: Sherlock Title: A Study in Pink Season: 1 Episode 1