Property cannot be found on a hashtable passed in from another script

I can't believe how difficult it is to find how to parse and use parameters passed in from another script!  I've been at this for almost 5 hours.

There are plenty of articles on how to create a hashtable, and some on how to pass a hashtable to another script, but nothing on what to do with the hashtable once the target script receives it.

This is an excerpt from "Test 1A-sending script.ps1"

$parms = @{
    ComputerName = 'mike';
    ComputerId = 'SYS 001'
}

#Display hashtable
$parms.Keys
$parms.Values

$filePath = ".\Test 1B-receiving script.ps1"
$commandLine = "-NoExit & `'$filePath`' $parms"
Write-Host `n$commandLine -f Cyan

Start-Process Powershell.exe -ArgumentList $commandLine

and this is an excerpt from "Test 1B-receiving script.ps1"

Param(
    $parms2
)

Write-Host "Made it to test 1B."
Write-Host $parms2 -ForegroundColor Yellow
Write-Host $parms2.ComputerName -ForegroundColor Gray

Here are the results of running the sending script, which appear in a separate window for the receiving script:

Made it to test 1B.
System.Collections.Hashtable
The property 'ComputerName' cannot be found on this object.  Verify that the property exists.
At: C:\Workshop\PowerShell-work\Passing arguments\Test 1B-receiving script.ps1:61 char:1
+Write-Host $parms2.ComputerName -ForegroundColor Gray