Use powercli without UI

Hello

I have created a powershell script with use some commands like :

• Connect-VIServer -Server $server -User ....
• Set-VM -VM $vm -SnapShot $snap -Confirm:$false
• New-Snapshot -VM $vm -Name $snapshotName -Description $description -Confirm:$false
• $vm=Get-VM -name $vmName
• $snap = Get-Snapshot -VM $vm -Name $snapshotName
• Remove-Snapshot -Snapshot $snap  -Confirm:$false

and some of those commands make some Windows appears and disappear, taking focus.

During my script I want to use other applications. And these command make losing focus :-(

And if i press enter, sometimes involuntarily, it click on cancel on these popup Windows :-(

Is there is a way to tell to powercli to hide these Windows and make all silently ?

Thanks for advance

Nara20