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.
(..) We've been here for hours. We can't afford to anchor a unit down to one location. I am bagging you to stay. Just got a word from my sergeant, we're pulling the plug. I am staying. No you aren't. We have specific orders you came with us, you are leaving with us. Watch your head. (..)2008 Gran Torino