DisplayMessage(x10,xDT,xMSG#,xID,x00,xPR,+XXXXX,+YYYYY,+ARPOS,xOT)

Displays a dialogue box.  Text for dialogue boxes should be placed after the EventEnd() command.

DT = Dialogue Type.
-x01: Top of Screen
-x02: Bottom of Screen
-x04: Thinking
-x08: No Arrow
-x10: Dialogue Box
-x20: Named Box ("Check" if x10=False, "Help" if True.)
-x40: Independent Message Box
-x80: Close with Instruction

MSG# = Message ID.
-Message's ID in Event.  Starts at x0001.

ID = Unit ID.
-Speaking Unit's Unit ID in ENTD.

PR = Portrait Row.
-Row parameter when forcing a WLDFACE.BIN Portrait.  Must be paired with {51}PortraitCol to use, see that command for more information.

XXXXX = X-Coordinate.
-Moves dialogue box along screen's X-axis, is signed.

YYYYY = Y-Coordinate.
-Moves dialaogue box along screen's Y-axis, is signed.

ARPOS = Arrow Position.
-Moves Arrow along dialogue box's X-axis.

OT = Dialogue Box Opening Type.
-x01: adds +50% Opening Speed
-x02: removes -50% Opening Speed
-x10: toggles arrow facing, Left=False, Right=True.

