You could as well just define a little bit more what you want to monitor and there might even be a ready to use script available already.
Besides that, you will find plenty of examples within your PRTG installation, on the PRTG web site in the online manual and so on.
You will need to have some knowledge about writing PowerShell scripts, besides that it is only about the output that this script will actually give back to PRTG to process.
Hope that helps a bit further... I have a lot of examples written and posted in the PRTG KB here and on my personal blog on my web site - but if you want something specific, I suggest you define it and we see if we can help you out.