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.
(..) Don't hate me, Trinity. I'm just a messenger. And right now, I'm going to prove it to you. If Morpheus was right ... ... there's no way I can pull this plug. If Neo's the One ... ... then there'd have to be ... ... some kind of a miracle to stop me. Right? I mean, how can he be the One ... (..)1999 The Matrix
(..) ... I choose the Matrix. The Matrix isn't real. I disagree, Trinity. I think the Matrix ... ... can be more real than this world. All I do is pull the plug here. But there ... ... you have to watch Apoc die. Trinity. - Welcome to the real world. - But you're out, Cypher. - You can't go back. (..)1999 The Matrix