There are 9 or 10 copy buffers defined in the X server. Early window
managers had mechanisms to cut/copy/paste to more than the primary
copy buffers. This was a mistake, and since shortly after the
Earth's crust cooled window managers settled on using just the one.
I've seen code that had apps communicate thru the other buffers, but
I think we've all seen ugly things. I think Tk hangs things on X-
server atoms as an IPC mechanism, but it may use the copy buffers, too.
RE Copy problems
Ever since I enabled "Use the system keyboard layout" and "Enable
keyboard shortcuts under X11" in the preferences, I've had little
problems with cut/copy/paste. Despite the warnings in the dialog box
about possibly messing with Meta modifiers, I haven't seen a
problem. It seems that local X clients (local xterm and emacs)
understand cmd-C, cmd-V, and cmd-X, while remote non-Mac x clients
don't, but X11-native select and middle-click seem to work.
--Mike Zuhl
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