| Name | Description | |
|---|---|---|
 | IsRedoing | Determines whether the history service is currently redoing an unit |
| IsUndoing | Determines whether the history service is currently undoing an unit |
| IsUndoingOrRedoing | Determines whether the history service is currently undoing or redoing an unit |
| MaxUndoLevels | Controls the max depth of the undo stack. Setting this property will automatically clear the extra units in the undo stack. By default set to 100. |
| OwnerDocument | Gets the resolving document. The resolving document is the root document monitored by this history service. |
| RedoStack | Gets the Redo units stack |
| TransactionStack | Gets the Transaction units stack |
| UndoStack | Gets the Undo units stack |
| UndoStackDepth | The current undo stack depth. Note that this value may be different than the count of items in the UndoStack, since the UndoStack depth cannot exceed MaxUndoLevels. |
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