You can do that  whith window(1) which is part of NetBSD or with GNU
   screen. Latest screen version is 3.6.2 and it's available from
   prep.ai.mit.edu:/pub/gnu/screen-3.6.2.tar.gz. 

nit:  screen is NOT a gnu product.  the fsf once released their
own version of screen, but quickly removed it when they learnt
that the current screen maintainers were still working on screen
(this is from over 3 years ago).

.mrg.