I needed to adjust NTFS folder security using powershell on a remote folder.  The user was 'LOCAL Service'.  The command contains the ` character, it's a escape key for having double quotes inside a string.   Interesting way of powershell handling that.    Better than VBScript and Chr(34) etc..

param
(
 [String] $MachineName
)

$cmd="cmd /c C:\windows\system32\icacls.exe E:\WWWLogs\W3SVC1 /grant `"NT Authority\LOCAL SERVICE:(OI)(CI)(M)`""
$server=$MachineName
#$user="domain\userName"
#$pass="p@ssw0rd"
$process = [WMIClass]"\\$server\ROOT\cimv2:Win32_Process"

#$process.psbase.Scope.Options.userName=$user
#$process.psbase.Scope.Options.Password=$pass
#$process.psbase.Scope.Options.Impersonation = [System.Management.ImpersonationLevel]::Impersonate
#$process.psbase.Scope.Options.Authentication = [System.Management.AuthenticationLevel]::PacketPrivacy
$process.Create($cmd)

# get process id and returnValue
$process.ProcessId
$process.ReturnValue

One thing I couldn't get around was the command line arguments.  When I tried to launch powershell remotely using
$cmd="powershell C:\windows\system32\icacls.exe E:\WWWLogs\W3SVC1 /grant `"NT Authority\LOCAL SERVICE:(OI)(CI)(M)`"", it wouldn't work. 

I had to revert using cmd.exe to handle the process.  If a powershell guru know how to do that, please post. :)

Happy Powershelling.

Steve