HC: prototypes for the server command handlers
CC: array of server commands
AT: server_command
-IN: para afh server list user_list
+IN: para error string afh afs server list user_list
SN: list of server commands
---
-N: chs
-P: AFS_READ | AFS_WRITE
-D: change the current audio file selector
-U: chs [new_selector]
-H: Shutdown the current selector and activate new_selector. If no
-H: argument was given, print the name of the current selector.
----
N: ff
P: VSS_READ | VSS_WRITE
D: jump amount of time forwards or backwards in current audio file