tmux is a great alternative to screen if you’re looking for multiple virtual sessions in one terminal window.
Useful commands:
Ctrl-b c : open new session
Ctrl-b n | p : cycle next / previous through sessions
Ctrl-b % | ” : split horizontally / vertically
Ctrl-b left | right | up |down : cycle back /forward through visible split windows (left/right if split horizontally, up/down if split vertically)
Using Putty SSH, if you’re not getting line characters for the splits, change session charset to UTF8.