Are there any shortcuts for the globalAnnouncement command?

Yes, you can also use ";ga" or ";broadcast".

What rank do I need to use the globalAnnouncement command?

You need the Head Admin rank or higher in HD Admin to use this command.

Type ;globalAnnouncement in the chat while playing a game with HD Admin installed.

No, this command only works in games that have the HD Admin plugin installed by the game developer.

HD Admin Head Admin

The globalAnnouncement command opens the global announcement menu to send announcement to all games.

This command opens the global announcement menu to send announcement to all games.

;globalAnnouncement

Example: ;globalAnnouncement

This command opens the global announcement menu to send announcement to all games. The message is visible only to players currently in the game.