DISPLAY
to get the default host and display number.
Xrdp disconnect utility
xrdp-dis
xrdp-dis is run with no parameters to disconnect your xrdp session.
DISPLAY
to get the default host and display number.
/run/xrdp/sockdir/xrdp_disconnect_display_*
UNIX socket used to communicate the disconnect request to xorgxrdp.
5 releases since Debian 9 (Stretch); the text changed 3 times.