List of properties for a parameter?

I understand all of this except how they found ‘workingset’. How do I obtain a list of properties for a parameter (such as -filterscript).

Get-Process | Get-Member

Get-Member displays properties and methods about any object passed to it. gm is an alias for Get-Member

yup! This did it. Thank you. Giant list though, somwhat intimidating for a new user. Thanks!