The common and widespread status bar for screen, plus minor tweaks for the GNU screen configuration file (.screenrc). Copy from below or download it from here.

# Bind F11 and F12 (NOT F1 and F2) to previous and next screen window
bindkey -k F1 prev bindkey -k F2 next startup_message off

# Window list at the bottom.
hardstatus alwayslastline
hardstatus string "%-w%{= BW}%50>%n %t%{-}%+w%< | %c | %D %d"

# Enable mouse scrolling and scroll bar history scrolling
termcapinfo xterm* ti@:te@