Get Title of Windows From Other Sessions

How can I programatically get the title of windows running in other user sessions on the computer?

I tried using the following commands and utilities, all running elevated as an administrator. In all cases, I can see the process, but the title field is blank.

1. PowerShell command: Get-Process | Select MainWindowTitle
2. PowerShell command: Get-CimInstance Win32_Process | Select *
3. Microsoft Sysinternals Process Explorer
4. tasklist /v