This command will return the ID of the next contact node on the specified body. Once you have the ID of the contact node, you can get information about the it with b2GetContactNodeBody and b2GetContactNodeContact. You can then use b2GetNextContactNode to check the next node or b2GetPreviousContactNode to go back. The parameter should be the unique integer handle that was returned when the body was created.
Syntax
Return as Integer = b2GetBodyNextContactNode(ID as Integer)