PS C:\> $A = New-ScheduledTaskAction -Execute "Taskmgr.exe"
PS C:\> $T = New-ScheduledTaskTrigger -AtLogon
PS C:\> $P = New-ScheduledTaskPrincipal "Contoso\Administrator"
PS C:\> $S = New-ScheduledTaskSettingsSet
PS C:\> $D = New-ScheduledTask -Action $A -Principal $P -Trigger $T -Settings $S
PS C:\> Register-ScheduledTask T1 -InputObject $D