+:ping
+ping [<string>]
+Replies with hopefully-useful information, including:
+* Current time, number of IRC and system users, and load averages.
+* Most recent traffic on a relevant channel (if sent privately, any
+ channel we're both on, otherwise the channel in question.) Only
+ actual message traffic counts, and \!-commands don't count either.
+* The specified string, if any.
+I can tell you this automatically if you like - see `help !marktime'.
+
+:marktime
+!set marktime off Only an explicit `!ping' command sends you info.
+set marktime once Send ping info shortly after I first see you.
+set marktime <n>s Also send info every <n> seconds (min 300s).
+set marktime <n>ks Also send info every <n> kiloseconds (min 1ks).
+set marktime <n>m Also send info every <n> minutes (min 5m).
+set marktime <n>h Also send info every <n> hours (min 1h).
+