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.
(..) What did they do to you? It's what he did I'm proud of him They told me they'd keep me because they could plug me into any story and my salary was in line so I quit Jane, I got to tell you something (..)1987 Broadcast News