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Look at the ItemRenderer. Specifically renderStack

I believe that Cadiboo was suggesting you look at the implementations of those GUIs (i.e. GuiModList and GuiConfig) for examples. It looks like GuiModList uses GuiScrollingList and some of the children of GuiConfig extend GuiListExtended, so these are probably the places to start looking.

Not for every player. But let's say 'Alice' changes her 'mana' to 'true' and 'Bob' is tracking her, so 'Bob' gets a package with the data 'true'. Since 'Bob's client is the one receiving the package 'Minecraft.getMinecraft().player' is 'Bob' and not 'Alice'. So 'Bob's client sets the 'mana' of 'Bob' to 'true' and not of 'Alice'. IIRC i got the player out of the MessageContext the last time i used this and not from the Minecraft instance.

Scratch isn't programming. Well, it is, but it is to programming what riding a tricycle is to riding a motorcycle. It holds your hand so much and hides away complex systems (like what classes are and how to use them) that saying "I made a game in scratch" is about as useful to making a Minecraft mod is by saying "I wrote a book about Minecraft." Second Life's scripting language similarly hides away those kinds of details (not due to making it easy-to-use, like Scratch, but rather due to the technical specifications of how Linden Labs wanted to insure that any code being executed on any object could be paused, serialized, and deserialized, and restarted at any point in its execution, including in the middle of a command), and thus, also rather useless. The fact that some (very smart) people have done very impressive things with LSL doesn't mean that because you know LSL you can write Java. That'd be like me saying that I've published a best selling novel in English, so next I'll try Chinese.

Don't tell ppl "do your research before posting here" as the README.txt file that comes with the MDK of Forge 1.13.2 25.0.9 and 25.0.10 says to use setupDecomWorkspace its obvious that the README.txt file was not updated but you don't have to be a dick.