Simply place it on your Delphi form, and, if you want to grant access, just use the function:

NetDrive.Connect(<network path>,<user name>,<password>);

The NetDrive Connect function returns the letter for the new drive.
Make your actions using this drive, and the use NetDrive.Disconnect. Your user will not even see what's happening (if a Windows Explorer is visible at the same time, he might see a new drive flashing up and disappear again). Attached to TNetDrive are two events called OnConnect and OnDisconnect. The meaning should be clear.

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