Pls post code to start/open an Excel file and then close the file

Pls post :-

(1) Codes to start/open a particular Excel file (eg xyz.XLS in path c:\abc) and
(2) Codes to save this XLS and
(3) codes to close this XLS file

preferably in VB. I want to just keep the Excel file opened and saved at the background (ie without notice to users.

Thanks a lot.
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