[Vol-users] VAD nodes: Private memory, but Prototype PTEs?!

Hi all, I'm trying to understand what I've misunderstood. Consider this entry from a run of vadinfo: VAD node @ 0x84f1f3b0 Start 0x7ffde000 End 0x7ffdefff Tag Vadl Flags: CommitCharge: 1, MemCommit: 1, NoChange: 1, PrivateMemory: 1, Protection: 4 Protection: PAGE_READWRITE Vad Type: VadNone First prototype PTE: 94181720 Last contiguous PTE: 94181728 This node represents a range which is private (PrivateMemory: 1). If it's private, i.e. not shareable, why are there Prototype PTEs? I though prototype PTEs were only used when a range was shareable? I have a few Vadl nodes like this. The VadS nodes in the output with 'PrivateMemory: 1' don't show any prototype PTEs. Any pointers greatly appreciated.