$a = 1
$b = 2
New-PSSession -ComputerName MyRemoteMachineName | Out-Null
Invoke-Command -Session (Get-PSSession) -ArgumentList($a, $b) -ScriptBlock {
    $args[0]
    $args[1]
}
Get-PSSession | Remove-PSSession

$myString = "Something"
New-PSSession -ComputerName MyRemoteComputerName | Out-Null
$outputFromSession = Invoke-Command -Session (Get-PSSession) -ArgumentList($myString) -ScriptBlock {
    $args[0] + " " +  $env:COMPUTERNAME
}
$outputFromSession
Get-PSSession | Remove-PSSession