Being new to Powershell, it took me a few minutes to figure out how to install WASP. I am running Windows 7, which has Powershell version 2 built in. Not sure if this applies to v1.0 of Powershell:
Download WASP and extract the files
Take the extracted WASP.DLL and copy it to C:\Windows\system32\WindowsPowerShell\v1.0\Modules\WASP\WASP.dll.
# run commands using WASP, e.g.
See examples at http://hinchley.net/2009/10/29/using-send-keys-with-windows-powershell-to-automate-dialog-actions