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public gADO As ADODB.Connection

This statement declares a public variable aka Global variable as an ADO (Active Data Objects) Connection object.

This object allows you to connect to a database and run queries.

What is ADO?

What is ODBC?

What is a connection?

Do I have to know this?

Not really, if you use the routines in the ExpertAtExcel Module, it handles the details of connecting to a database.

Connecting to a database is where the system sign's in and sets up a path so that you can run queries against it.