== Response Codes ==
100 Information
200 Command succeeded, no extra information
-201 Command succeeded, array follows (<length> <items> <items> ...)
+201 Command succeeded, multiple lines follow (<length>)
202 Command succeeded, per-command format
400 Unknown Command
401 Not Authenticated (or Authentication failure)
c ITEM_INFO <item_id>\n
s 202 Item <item_id> <price> <description>\n
--- Get Users' Balances ---
-c ENUM_USERS[ <max balance>]\n
+ <max balance> and <min balance> can be '-' to indicate "none"
+c ENUM_USERS[ <min balance> [<max balance>]]\n
s 201 Users <count>\n
s 202 User <username> <balance> <flags>\n
...
-s 200 List End
+s 200 List End\n
--- Get a User's Balance ---
c USER_INFO\n
s 202 User <username> <balance> <flags>\n