If you have a concurrent license you can get the number of sessions running this way, just set $hzConn to the connection server, $hzUser to a user that con logon to the connection server, $hzPass to $hzUsers password, and $hzDomain to the domain that $hzUser is in. I got this from Horizon View API - The SLOG – SimonLong/Blog
# Import the Horizon module
Import-Module VMware.VimAutomation.HorizonView
# Establish connection to Connection Server
$hvServer = Connect-HVServer -server $hzConn -User $hzUser -Password $hzPass -Domain $hzDomain
$ViewAPI = $hvServer.ExtensionData
$query_service = New-Object "Vmware.Hv.QueryServiceService"
$query = New-Object "Vmware.Hv.QueryDefinition"
$query.queryEntityType = 'SessionLocalSummaryView'
$Sessions = $query_service.QueryService_Query($ViewAPI,$query)
$Sessions.Results.NamesData | Select-Object -Property UserName,DesktopType,DesktopName,MachineOrRDSServerDNS
Named users would be harder since you need to count the users. The API has a license function, but its just the features enabled in the license not the usuage.
