SF: play.c
SN: list of commands
---
-N: help
-D: Display command list or help for given command.
-U: help [command]
-H: This command acts differently depending on whether it is executed in command
-H: mode or in insert mode. In command mode, the list of keybindings is printed.
-H: In insert mode, if no command is given, the list of commands is shown.
-H: Otherwise, the help for the given command is printed.
----
N: next
D: Load next file.
U: next