FOCUS Enhancements 3.2 - Manual (Page 136)

External Control Commands
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Playlistplay
This command initiates playback as soon as the files are fully
queued up and loaded. There may be a slight delay between this
command and playback.
The Playlistplay and Playlistload commands behave the same
except Playlistplay starts playback automatically, whereas
Playlistload only loads up the playlist. Yet, an Mpgplayall
command is required to actually start playback. Playlistload is for
when you need to control the exact time the playback begins.
Syntax
playlistplay name once
Parameters (optional)
name
Name of the playlist file (e.g., loop1.fpl). You do not need to include the
.fpl extension.
once
0 loops the playlist endlessly (default). 1 plays the playlist once through
and stops.