set-option -g base-index 1
set-option -g pane-base-index 1
# Renumber windows sequentially after closing any of them
-#set-option -g renumber-windows on
-#Commented out - it doesn't work with my tmux.
-#Perhaps tmux in Debian 7 is too old.
+set-option -g renumber-windows on
# Attempt to set the client terminal title
set-option -g set-titles on