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bitsadmin getnotifyinterface

Determines whether another program has registered a COM callback interface (the notify interface) for the specified job. Windows commands reference

On Windows

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Windows

from the Windows commands reference, CC BY 4.0
bitsadmin /getnotifyinterface <job>

To retrieve the notify interface for the job named myDownloadJob

bitsadmin /getnotifyinterface myDownloadJobIdentify
jobThe job's display name or GUID.