What type of plug-in are you building?
I am building a plugin that queries Sequence information and uploads it into our tracking database. So I guess its an "exporter" of some kind. But I am only exporting information. Hope that helps.
After digging through the sdk it seems like my only option might be the IterateNodeProperties function, but I have no idea how to use it, mainly the SegmentNodePropertyCallback bit. So if anyone knows how to set that up that would also be very appreciated. Thanks.