Reusing a Concurrency
From within Excel, you can open or create multiple workbooks by using the toolbar buttons or the File menu. Opening multiple workbooks this way enables Office Connector to reuse a single concurrency for all of your workbooks. By contrast, if you launch Excel multiple times, then you will use multiple concurrencies of Office Connector.
Releasing a Concurrency
Prior to Office Connector 2.2.x, concurrencies are released when Excel is closed.
Office Connector 2.2.x and above releases concurrencies when all Office Connector workbooks are closed, and it is not necessary to completely close Excel.