This is another example on using Show-command to create simple user interface

GUI-V2.ps1

Function Install-WEBService
	{
		[CmdletBinding()]
		Param
		(	
			[Parameter(Mandatory=$true,position=0)]
			[String]${_0_User},

			[Parameter(Mandatory=$true,position=1)]
			[String]${_1_Password},

			[ValidateSet("None", "NTLM/Kerberos")]
			[String]$Authentication = "None",						

			[int]${Port    [Default is 8550]} = 8550,

			[String]${Url [Default is OSDInfo]} = "OSDInfo",

			[ValidateSet("YES", "NO")]
			[String]${Use SSL  [Default is No]} = "NO"
		)

		$User =	${_0_User}
		$Password =	${_1_Password}
		$Port = ${Port    [Default is 8550]}
		$url = ${Url [Default is OSDInfo]}
		$SSL = ${Use SSL  [Default is No]}	

		Write-Host "User: $User"
		Write-Host "Password: $Password"
		Write-Host "Authentication: $Authentication"
		Write-Host "Port: $Port"
		Write-Host "URL: $url"
		Write-Host "ssl: $ssl"
	}	

cls
$Result = Show-Command Install-WEBService -NoCommonParameter -PassThru
Invoke-Expression $Result