to just after the first non-listed track before it, or to the head if there is
no such track.
.TP
+.B nop
+Do nothing. Used by
+.BR disobedience (1)
+as a keepalive measure.
+.TP
.B part \fITRACK\fR \fICONTEXT\fI \fIPART\fR
Get a track name part. Returns an empty string if a name part cannot be
constructed.
Some state change occurred. The current set of keywords is:
.RS
.TP
+.B completed
+The current track completed successfully.
+.TP
.B disable_play
Playing was disabled.
.TP
.B enable_random
Random play was enabled.
.TP
+.B failed
+The current track failed.
+.TP
.B pause
The current track was paused.
.TP
+.B playing
+A track started playing.
+.TP
.B resume
The current track was resumed.
+.TP
+.B scratched
+The current track was scratched.
+.PP
+To simplify client implementation, \fBstate\fR commands reflecting the current
+state are sent at the start of the log.
.RE
.TP
.B volume \fILEFT\fR \fIRIGHT\fR
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