Yes.
1) Create an NUMBER type attribute in SystemSettings BO: IDtoConfirm
2) Assuming your BO you are trying to register & confirm is called Registration, create a rule in Registration:
If Registration IS NEW Then
SystemSettings.IDtoConfirm=Registration.ID
3) Create a Custom Presentation for Registration that displays the registration confirmation info.
4) Create a Query called ConfirmRegistration to display Presentation from #3 above.... where statement will be:
FIND Registeration WHERE Registration.ID=SystemSettings.IDtoConfirm
5) In your process called "DisplayConfirm" you will now have only 1 line:
DISPLAY ConfirmRegistration
You will also need to make sure that your Guest access level gives appropriate access to SystemSettings.