As you may know, Select-Object can return the content of an object property when you use the parameter -expandProperty. This will get you a list of all software manufacturers of all running processes:
Get-Process | Select-Object -expandProperty Company
Unfortunately, Select-Object -expandProperty has a number of limitations. For example, if there is no company information in a process object, you will get an error and the list is incomplete. As a non-Administrator, you will experience this regularly because you cannot access processes that are owned by someone else.
Instead, a much better and more robust way is to use Foreach-Object:
Get-Process | Foreach-Object { $_.Company }
This approach is fault-tolerant and it also avoids some of the other bugs in Select-Object -expandProperty.
