dtach is a tiny program that emulates the detach feature of screen,
allowing you to run a program in an environment that is protected
from the controlling terminal and attach to it later. dtach does not
keep track of the contents of the screen, and thus works best with
programs that know how to redraw themselves. It is designed to be
transparent and un-intrusive; it avoids interpreting the input and
output between attached terminals and the program under its control.

dtach does not, however, have the other features of screen, such as its
support of multiple terminals or its terminal emulation support. This
makes dtach extremely tiny compared to screen, making it more easily
audited for bugs and security holes, and also allows it to fit in
environments where space is limited, such as on rescue disks.
