I have done something similar (I think) to what you are trying to do. It starts out with one subform filling the whole page with a white background and a password input. If the password is correct, the password subform is hidden and the next subform is visible - the screen now shows the input subform. Once this is complete I hide the input subform and show the main document.
At each task layer you could have the input stored in variables.
Is this was you're asking for?