12B85 | 
 FlashMsg
 | 
( $ →  ) 
Displays message in status area, then
restores it to normal.
 | 
38926 | 
 FlashWarning
 | 
( $ →  ) 
Displays message in a message box and
beeps. Waits for OK to be pressed.
 | 
38908 | 
 DoWarning
 | 
( $ →  ) 
Displays message, beeps and freezes status
area.
 | 
0000B1 | 
~DoMsgBox
 | 
( $ #x #y grob menu → T ) 
Displays a message box with a grob in the
upper left corner and the specified menu.
If no grob is desired, use MINUSONE.
The meaning of #x and #y is unclear - it
seems that any BINT will do.
 | 
0020B1 | 
~MsgBoxMenu
 | 
(  → {} ) 
The messsage box menu, with just the OK key.
 |