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I am wondering if two people have the same single player mods on a Minecraft SMP server, will they be able to use them as if they were a server mod?

For instance if we were the only ones on the server and we both had aircraft mod, could we build aircrafts?

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    both you and the server must have the mod.
    – user8949
    Commented Jul 21, 2011 at 14:38
  • Why don't they call it Multiplayer Mods?????
    – Jont
    Commented Dec 22, 2013 at 3:20

3 Answers 3

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My favorite kind of answer to my favorite kind of question:

It depends

Some mods, like mods regarding high-res textures, are single-player mods that do not affect the communication with the server, and can therefore be used irrespective of server configuration.

Other mods, like aircraft mods, require server support in order to work.

In general, the description of any given mod will list if it's compatible with vanilla servers, if it only takes effect in SSP, or if it requires a modded server.

Edit: In response to comments; one piece of clarification:

Some mods function somewhat more like exploits based on the fact that the server allows a certain amount of client-side processing of things like falling. Mods that function by misrepresenting the effects of gravity, for instance, can function without server support, at least until the communication protocol is changed to handle all movement server-side, assuming that ever happens.

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  • Some mods, like the ability to fly, do affect communication with the server, yet don't require server support. (Tho servers now can kick people off who do use flying, if so configured.)
    – dlras2
    Commented Jul 21, 2011 at 15:02
  • I've heard of the planes mod being used on a smp server by forcing all players to download it, did they also have to do some heavy configuring or what's the deal? Commented Jul 21, 2011 at 15:09
  • @Garet: Sounds like a bucket thing. Commented Jul 21, 2011 at 15:10
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    @Dan: Answer updated to reflect your comment. Commented Jul 21, 2011 at 15:10
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Yes you can, it's easy - download the mod, copy the classes to minecraft.jar, run Minecraft, then close Minecraft, open %appdata%/.minecraft and there will be a text document called single player commands or spc or something like that. Open that, at the very bottom of the txt file press enter and type:

mcuse.(SERVER ADRESS HERE YOU WANT TO MAKE IT WORK ON) = true

for example:

mcuse.(mc.jackos.cu.cc:25603) = true
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    The question asks about single player mods in general, not the specific mod called Single Player Commands.
    – Schism
    Commented Oct 20, 2012 at 0:09
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No, it doesn't matter if two players have the same mods: it is run through the server. The server must have the mods.

This will confirm it:

http://uk.answers.yahoo.com/question/index?qid=20110316085931AAaNc7S

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