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I don't care about panel plugins or programs such as xclip or xsel.

I just want to know : when I cut or paste something on Xubuntu, what program handles it?

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This article and this one outline some important points about X's handling of its buffers and the clipboard. – user76204 May 11 '13 at 20:49

It's the /usr/bin/X program.

Every program acts as a X client for the X server.

As Michael Toren states: "Copy-paste exists in all X Windows implementions, independent of the Window Manager".

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Are you sure? Thanks to you I just read the X manual and I understood the clipboard functionnality was made through xclipboard. Am I wrong? – Hyogapag May 14 '13 at 23:53
xclipboard doesn't implement the clipboard functionality. It is just another (primitive) GUI clipboard manager. – user85164 May 15 '13 at 1:17
Ok, thanks then ! – Hyogapag May 15 '13 at 4:19

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