Vista - Process Monitoring

I'm trying to monitor a component Service via Powershell script. my
requirment is: if the process DLLhost.exe, that is launced by a specific user
name, goes above 35 % CPU utalization for 5 min send alert, via SCOM.

My questions are:
1.) how do I check the User name of a process via Powershell.
2.) are there any logs that I can use to find historical CPU usage or will I
need to have my script running and sleeping to keep track of the CPU usage?

Thanks

1) gwmi win32_process -filter "name='mstsc.exe'" | %{$_.getowner().user}
2) no, there is no logs about CPU utilization. However you can use
Performance Monitor counters and/or trace logs. Or rerun your script each
time.
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