what is powershells Stop-Process doing

More-Testing-Try-Catch.ps1

Write-Host "Host Version:" $Host.Version

Try 
{
    Write-Host "before!"
    Stop-Process 123456789 -EA Stop
    Write-Host "after!"
}
Catch
{
    Write-Host "caught red handed!"
}
Finally 
{
    Write-Host "finally!"
}

<#
C:\Users\geoff\Desktop> .\Testing-Try-Catch.ps1
Host Version: 5.1.19041.1
before!
caught red handed!
finally!
#>

Testing-Try-Catch.ps1

Write-Host "Host Version:" $Host.Version

Try 
{
    Write-Host "before!"
    Stop-Process 123456789
    Write-Host "after!"
}
Catch
{
    Write-Host "caught red handed!"
}
Finally 
{
    Write-Host "finally!"
}

<#
C:\Users\geoff\Desktop> .\Testing-Try-Catch.ps1
Host Version: 5.1.19041.1
before!
Stop-Process : Cannot find a process with the process identifier 123456789.
At C:\Users\geoff\Desktop\Testing-Try-Catch.ps1:6 char:5
+     Stop-Process 123456789
+     ~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (123456789:Int32) [Stop-Process], ProcessCommandException
    + FullyQualifiedErrorId : NoProcessFoundForGivenId,Microsoft.PowerShell.Commands.StopProcessCommand

after!
#>
finally!

what a pain in the butt.