CmdID / PowerShell / Cmdlets / New
Creates a GUID. PowerShell reference
From the PowerShell reference
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Creates a GUID. The New-Guid cmdlet creates a random globally unique identifier (GUID). If you need a unique ID in a script, you can create a GUID, as needed.
New-Guid [<CommonParameters>]
Create a GUID
New-Guid
Its page in the reference: New-Guid.