How can I make UI pop up on everyone's screens, in multiple servers?

Help and Feedback Scripting Support
#1

The title speaks for itself.

#2 
local MessagingService = game:GetService("MessagingService")

MessagingService:SubscribeAsync("GlobalMessage", function(Message)
	print(Message.Data)
end)

to send data to every single server:

MessagingService:PublishAsync("GlobalMessage", "aeaeaeae")
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