Everything that you can do in SSP can be done in SMP if the server has NEI installed. If not then NEI can still spawn items using the give command if you are an OP. Most of the features are only enabled for OPs.
(From NEI's minecraft forum page)
Just drop the NEI thing, my decision is already made. This is all pointless
Please enjoy the screenshots I have taken! If you would like to post some of your own please do so!
Server: (just some terrain)
Thank you to all of the creators of the mods I am using to make my modpack. I really
am thankful for these mods, without them there would be no modpack at all. It is them,
the creators themselves, that made this modpack what it is and will be in the future.
All of the names of the mods and their crators are below as well as the link to the mods pages.
There are also a few mods to make some mods work that are by the same
creator or something such as a update checker for a mod by the creator
Full credit for these goes to the creator of the mod and the add-on.
The mods I have created were made with Pylo's Mcreator since I can not
code with Java at all. Any of the mods I have created are credited to
myself (thebaum64) and Pylo's Mcreator. Link to Pylo's Mcreator is below: