NotebookObject[
fe
,
id
] is an object that represents an open notebook in the front end.
fe is a FrontEndObject which specifies the front end in which the notebook is open.
id is an integer that gives a unique serial number for this open notebook.
Functions such as NotebookPrint and NotebookClose take NotebookObject as their argument.
Within any open notebook, there is always a current selection. The current selection can be modified by applying functions such as SelectionMove to NotebookObject.
