A transaction allows a set of changes to be grouped together and committed at the same time.

The registry provider supports transactions, as shown in the following code:

PS> Get-PSProvider

Name            Capabilities                         Drives 
----            ------------                         ------ 
Registry        ShouldProcess, Transactions          {HKLM, HKCU} 
Alias           ShouldProcess                        {Alias} 
Environment     ShouldProcess                        {Env} 
FileSystem      Filter, ShouldProcess, Credentials   {B, C, D} 
Function        ShouldProcess                        {Function} 
Variable        ShouldProcess                        {Variable} 

A transaction may be created as follows:

Start-Transaction 
$path = 'HKCU:TestTransaction' 
New-Item $path -ItemType Key -UseTransaction 
Set-ItemProperty $path -Name 'Name' -Value 'Transaction' -UseTransaction 
Set-ItemProperty $path -Name 'Length' -Value 20 -UseTransaction 

At this point, the transaction may be undone:

Undo-Transaction 

Alternatively, the transaction may be committed:

Complete-Transaction 

A list of the commands that support transactions may be viewed, although not all of these may be used with the registry provider:

Get-Command -ParameterName UseTransaction