Raindrop Documentation:

void Raindrop:AddCommand(command, arguments, func_call)

Adds a command to the Raindrop command handler.

NOTE: Raindrop commands always have priority over custom commands! (ex: you cant register "ws").
Examples:

--Add command "speed", with 1 argument.
Raindrop:AddCommand("speed", 1, function(player)
	local p = game:GetService("Players"):FindFirstChild(player)
	if p then
		p.Character.Humanoid.WalkSpeed = 75
	end
end)

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void Raindrop:MessageBox(text, title)

Displays a MessageBox on the user.

Examples:

Raindrop:MessageBox("Hello", "World")

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string Raindrop:DownloadString(url)

Downloads a string from the internet.

Examples:

print(Raindrop:DownloadString("http://example.com"))

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void Raindrop:CopyString(str)

Copy's string to clipboard.

Examples:

Raindrop:CopyString("hello world")