How to add a custom field to a node


Active member
I think the title is self explanatory.
I want to add an option to within the node editor. (Amongst the title / display order / parent node etc).
Basically I want to have an option which chooses that forums 'thread complete' prefix. (So I can implement a one click "Mark thread as complete" over multiple forums).

I understand if it's rather tricky, just pointing me in the general direction will help :)
I've tried looking at other's plugins to see how it's done (For example NodesAsTabs, or Waindigo's Custom Fields plugins), but they seem to be part of a bigger 'library' of plugins so their code is more complicated than I need it to be.

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