Can I send some text to the STDIN of an active process under Windows?

I searched the web for that question and landed on Server Fault:

Can I send some text to the STDIN of an active process running in a screen session?

Seems like it is ridiculously easy to achieve this under Linux. But I need it for a Win32 Command Prompt.

Background: I have an application that polls STDIN and if I press the x key, the application terminates. Now, I want to do some automated testing, test the application and then shut it down.

Note: Just killing the process is not an option since I'm currently investigating problems that arise during the shutdown of my application.

.NET framework's Process and ProcessStartInfo classes can be used to create and control a process. Since Windows PowerShell can be used to instantiate .NET objects, the ability to control almost every aspect of a process is available from within PowerShell.

Here's how you can send the dir command to a cmd.exe process (make sure to wrap this in a .ps1 file and then execute the script):

$psi = New-Object System.Diagnostics.ProcessStartInfo;
$psi.FileName = "cmd.exe"; #process file
$psi.UseShellExecute = $false; #start the process from it's own executable file
$psi.RedirectStandardInput = $true; #enable the process to read from standard input

$p = [System.Diagnostics.Process]::Start($psi);

Start-Sleep -s 2 #wait 2 seconds so that the process can be up and running

$p.StandardInput.WriteLine("dir"); #StandardInput property of the Process is a .NET StreamWriter object