FacetTerm® is the award winning software utility that allows character applications running in a terminal emulator (or actual terminal) to run up to 10 simultaneous sessions and hot-key between them when connected to a UNIX or Linux server. You can copy and paste between sessions, print the screen, have FacetTerm "watch" for off-screen activity and more.
FacetTerm is a tremendous productivity tool for character-based UNIX applications. The payback for FacetTerm in terms of increased user productivity is often less than 2 weeks.
FacetTerm has been part of HP's HP-UX® operating system for decades as tsm (Terminal Session Manager).
FacetTerm is available for various LInux distributions, IBM AIX, SCO UNIX, Sun OS and FreeBSD (and of course, if you have HP-UX, your already have it as tsm).