Is it possible to use VBA to disable the Save andSave As... functions in Excel for a particular application?

I was thinking of something like this, placed in the ThisWorkbook VBA module:

Code:
On ApplicationSave
    MsgBox "Application cannot be saved"
Close Workbook
I am not sure of the exact syntax but basically that describles what I want to do. Would this work, or is there a better way of doing it?

Thanks
-Rob