The ID of a post is a sequential and unique number which is automatically generated by b2evolution when you create a new post, and lets the system identify that post in all the action to come. In general, it wouldn’t be necesary to know that number, but if you are in a particular situation and need to get it, you can do the following:

1. Go to the edit view of the item.
2. At the top of this window, you should see a title like this: Item #XX.
3. The number after the (#) symbol is the Object ID.