Hi,
It's documented in Xsession(5) manpage:
SESSION TYPES
Xsession may optionally be passed a single argument indicating the type
of X session to be started. It is up to the display manager to set the
argument, and there is no way to pass Xsession an argument from startx
or xinit. By default, three different arguments are supported:
regards,
junichi
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dancer@{debian.org,netfort.gr.jp} Debian Project