How does that work? Is there more than one clipboard? How many are there? Do all X11 clients support all forms of clipboards?

Some bonus links:

https://keithp.com/~keithp/talks/selection.ps

https://www.jwz.org/doc/x-cut-and-paste.html

http://lists.slug.org.au/archives/slug-chat/2001/July/msg00054.html

source: L