Remote Desktop Connection from CMD

I created a file with the .bat extension, in which I wrote the following script:$Hostname = "MyHostname"$User = "MyUser"$Password = "ZZZ"cmdkey / generic: $Hostname / user: $User / pass: $Passwordmstsc / v: $Hostname /f

But I get the following error: The remote computer name ($Hostname) is not a valid name

With IP address it works, thank you!

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What command I have to type inside the .bat file to close command prompt window ?
With exit doesn't work.