To get all running processes on the remote computer, you need to use – ComputerNameparameter in Get-process cmdlet, WMI class Win32_Process or using the Get-CimInstance cmdlet.
Get-process -ComputerName Test-PC
To connect multiple computers use computer names separated by comma (,).
Get-process -ComputerName Test-PC, Win2k8
Get-WmiObject Win32_Process -ComputerName Test-PC, Win2k8
Get-CimInstance Win32_Process -ComputerName Test-PC, Win2k8