One pattern I've noticed, especially when dealing with commands that may or may not be executed locally is where a script offers a parameter for the computer name (or a list of computer names).

What Are People Doing?

Sometimes, that parameter will be defaulted to $env:ComputerName

[Parameter(Mandatory=$false, Position=1, ValueFromPipeline=$true)][string] $ComputerName = $env:ComputerName

Other times, there will be an if statement checking to see if the parameter is null and assigning $env:ComputerName if it has no other value.
if ($ComputerName -eq $null)
  $ComputerName = $env:ComputerName
From there, the script will go on to do something like 
$Result = Get-AllWonderfulAndGreatThings -ComputerName $ComputerName -Filter * -Mood Happy -ErrorAction SilentlyContinue
## How Can I Be Cooler?

[Splatting can offer another option.](/blog/2011/04/clean-up-your-parameters)  We still need to do a null check, but we can build up a hash table with the known parameters we would like to pass, and if $ComputerName exists, we can tack that on later.  We can then pass the whole thing to the command in one fell swoop.

$ParametersToPass = @{
  Filter = '*'
  Mood = 'Happy'
  ErrorAction = 'SilentlyContinue'
if ($ComputerName -ne $null)
  $ParametersToPass.Add('ComputerName', $ComputerName)
$Result = Get-AllWonderfulAndGreatThings @ParametersToPass

But, What if I Have Other Conditional Parameters?

Go for it.. this technique can be used to programmatically build function, cmdlet, and script calls for any sort of parameter.  

Want more great reading? Check out my reading list!