BNETDocs
S>C 0x19 SID_MESSAGEBOX
Message Id:0x19
Message Name:SID_MESSAGEBOX
Direction:Server to Client
Used By:Diablo II, Diablo II Lord of Destruction
Diablo Retail, Diablo Shareware
Starcraft Japanese, Starcraft Broodwar
Starcraft Shareware, Starcraft Original
Warcraft II BNE, Warcraft III The Frozen Throne
Warcraft III Reign of Chaos
Format:

(UINT32) Style
(STRING) Text
(STRING) Caption

Remarks

Displays a message to the user. This message's fields are used as parameters for the Win32 API MessageBox, and can be passed directly to it. For more information about these parameters, see the documentation for MessageBox at MSDN.

Some more research on the behavior of this packet in Starcraft Broodwar has been done by HarpyWar and xboi209. Their documentation can be found on GitHub. Specifically, their research shows how to display a small and large MessageBox inside the client. A large MessageBox also shows the Caption parameter, whereas a small MessageBox does not.

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