Determines whether or not commands from the given button are sent to session file. Generally this will be true, but if the command launches customisable functionality such as a dialog, it may be appropriate to issues session file commands only when the dialog is OK'd
| buttonNo | integer | type of button | 
| isSession | boolean | 1 (default) to send commands to session file. 0 to bypass session file | 
| Return value | none | 
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