I'd looking to bind a key to split a window while maintaining the current working directory in both windows. The below .screenrc entry, for example,
bind | eval "split -v" focus screen
properly creates a second region, however, the new region on the right of the vertical split defaults to the original directory from which screen session was originally launched (in the left window).
The below related work-arounds involve use of the command line via screen -X to transfer $PWD to chdir. I suspect that there is a way, however, for current environment
variables such as $PWD to be accessed from from within .screenrc itself,
since launching a nested screen window (without the split) defaults to
the current working directory in the second session.