linux - x server and application clients -

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I need some explanation about X server and applications. As described in the wiki, "X Server users and Client is for programs, ..., "

My question is, after the start of a Linux PC, for example, CentOS, in the beginning, is taking X server (keyboard, mouse, monitor) ) Starts to run,

  1. The X server will allow all later application programs Serve I / O for? If not, how to make program A through X server, while program B is not from X server?

  2. Regarding other GUI programs, e.g. If I have a QT program, does it even go through the X server, such as the keyboard / monitor & lt; - & gt; X server & lt; - & gt; Qt? If not, how is this condition controlled?

    1. Yes even the console Applications will also run in applications such as terminal which will be X's client.

    2. Yes Qt programs do through X.

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