Assistance with my script to find all opened windows (applications running) on remote computer

Question

Hello,
I have the following script whereby I want to list all the running (opened) applications on a remote computer.  It's a shared computer between two people who use the same generic ID.  Before one RDP's into it, I thought it would be interesting
to see if any apps are opened before logging in. 
Here is the code:
$cred = Get-Credential
Invoke-Command -ComputerName server123 {Get-Process *mail* | Where {$_.MainWindowHandle} | Select Name,MainWindowTitle} -Cred $cred
It works in that it asks for my credentials and runs without any error...but this script also does not display any running applications. I'm not sure what it should show. Perhaps I need to add a line of code to display what it found?
Another bit of info I would like to use in this script is to also confirm that the generic ID is logged in at the time I run this script.  I could use the following bit of code:
get-wmiobject Win32_ComputerSystem -computername server123 | format-table -property username
But when I run this code I get an access denied message. I'm assuming I need to use the Get-Credential again from my first script, but I'm unsure how to use it in the get-wmiobject?
Any help you can provide would be greatly appreciated.
Thank you.

Answer 1

Ok...shifting gears again.  Instead of running this remotely I'm thinking of running a scheduled task on the server and creating this .htm file.  That way no one has to run and enter in credentials (and if entered wrong cause issues with locking
out the account).  So, I've modified my script and confirmed that when I run it from Powershell when logged into the server, the results file correctly shows the logged in userid and the running applications (windows) I have opened. 
But, when I run this same exact script from my task scheduler, the running applications piece is blank?  The server I'm running this on is Windows Server 2008.  I've tried running it from Task Scheduler using Powershell and from a .bat file that
calls my Powershell script.  Both ways results in my .htm file not showing any applications running.  Yet when I run the same script (either from Powershell or the .bat file) the .htm file correctly shows the running applications.  My Task Scheduler
Job is using the same user id that I'm logged in with so there shouldn't be any permission issues with running from the task scheduler.
Here is my code:
$a = "<style>"
$a = $a + "BODY{background-color:peachpuff;}"
$a = $a + "TABLE{border-width: 1px;border-style: solid;border-color: black;border-collapse: collapse;}"
$a = $a + "TH{border-width: 1px;padding: 0px;border-style: solid;border-color: black;background-color:thistle}"
$a = $a + "TD{border-width: 1px;padding: 0px;border-style: solid;border-color: black;background-color:PaleGoldenrod}"
$a = $a + "</style>"
get-wmiobject Win32_ComputerSystem | ConvertTo-HTML -head $a -body "<H2>Logged in UserID</H2>" -property username | Out-File C:\Powershell_Scripts\Test.htm ; Get-Process |where {$_.mainWindowTItle} |Select-Object name,mainwindowtitle | ConvertTo-HTML -head $a -body "<H2>Open Applications</H2>" | Out-File C:\Powershell_Scripts\Test.htm -Append
Can anyone tell me what might be the reason for the script running from the scheduled task having issues?
Thank you.