Set/Reset a prefix on the PowerShell's Console Window title

Reset-PrefixedTitle.ps1

<#
.Synopsis
   Reset the window title of the console
.DESCRIPTION
   Reset the window title of the console
.EXAMPLE
   Reset-PrefixedTitle
#>
function Reset-PrefixedTitle 
{
    $originalTitle=Get-Variable -Name "__OriginalWindowTitle__" -Scope Global -ValueOnly -ErrorAction SilentlyContinue
    if($originalTitle)
    {
        Remove-Variable -Name "__OriginalWindowTitle__" -Scope Global
    }
    $host.ui.RawUI.WindowTitle=$originalTitle
}

Set-PrefixedTitle.ps1

<#
.Synopsis
   Sets a prefix on the window title of the console
.DESCRIPTION
   Sets a prefix on the window title of the console. e.g [prefix] original title
.PARAMETER  Prefix
   The prefix to set on the title
.EXAMPLE
   Set-PrefixedTitle -Prefix "MyPrefix"
#>
function Set-PrefixedTitle 
{
    param (
        [Parameter(Mandatory=$true)]
        [ValidateNotNullOrEmpty()]
        [string]$Prefix
    ) 

    $originalTitle=Get-Variable -Name "__OriginalWindowTitle__" -Scope Global -ValueOnly -ErrorAction SilentlyContinue
    if(-not $originalTitle)
    {
        $originalTitle=$host.ui.RawUI.WindowTitle 
        Set-Variable -Name "__OriginalWindowTitle__" -Value $originalTitle -Scope Global
    }
    $host.ui.RawUI.WindowTitle="[$Prefix] $originalTitle"
}