What is this deprecated code?

I am remaking an extremely useful plugin, by editing it’s source code. But it was created before I learnt how to script, and many of it’s functions are deprecated.

What would this of used to do?

local slider, sliderPos = LoadLibrary("RbxGui").CreateSlider(60, 300, UDim2.new(.5, -150, 0, 68))

And what was LoadLibary?

Thanks,
(Editing this plugin.)

Maybe this topic will help you:

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