OSC 9 ; 2 Message Box

OSC 9 ; 2 ; "text" ST shows text in a message box, a window of its own.

It is one of the commands ConEmu, a Windows terminal, put under OSC 9; the progress report page lists them all, and their definition is the ConEmu specific OSC table in ConEmu’s documentation. iTerm2 uses OSC 9 ; text ST for a notification, and a terminal that has both tells them apart by what follows the 9.

A default xterm ignores all of OSC 9, which is not among the OSC numbers it knows. libghostty-vt recognizes it and does nothing with it, so neither shows anything.

Validation

CONEMU2-1: Nothing happens

A
\e]9;2;"hello"\a
B

|AB____|
cursor 1,3
reply none