Running Xwin in passive mode

[KIDWELL, REX (SBCSI)]

Has anyone figured out how to run Xwin in the passive mode (sorry Exceed
terminology)?

Passive mode is defined as starting a Xserver in the background without a
full screen session manager.  The goal is to display individual X clients
like any other program running on a Windows platform.  I.E. run remote
xterms and dtterms from remote systems and display them like a DOS CMD
window.

An additional requirement would be to run them from a single Xwin invocation
so cut and paste would be supported between xterms.