Limitations of cp and mv?

[Mary Hsia-Coron]

I read in the AT&T System V release 4 manual pages that:

    - cp and mv cannot transfer DIRECTORIES across
      different file systems.

I'm writing some documentation and cannot verify this limitation
of cp and mv on a wide range of UNIX systems.

Questions:
----------

1) Does this limitation of cp and mv exist on BSD 4.3 based systems?

2) Does this limitation exist on System V systems PRIOR to release 4?

3) Does this limitation exist on your system? Please include info on:
    * What flavor of UNIX you have (ULTRIX, SUN, ZENIX, HP-UX, etc.)
    * Whether your UNIX system is based on AT&T system V, BSD 4.3, or a hybrid.
       
Thanks for any info you can provide!
Hewlett-Packard Customer Training
Mary Hsia-Coron