CmdID / PowerShell / Cmdlets / Show
Show-WmsDesktop
Displays the currently shared desktop to the specified sessions. Windows Server PowerShell reference
From the Windows Server PowerShell reference 5 parameters Its page in the reference
Parameters
-AllIndicates that this operation applies to all sessions on the target host.-Desktop-Server, -ComputerNameSpecifies the fully qualified host name of the MultiPoint Server that is the target of the command.-SessionIdSpecifies an array of session IDs.-TitleSpecifies a title.