Also, there is a nice example in the "web2py cookbook" Source code is here:
https://github.com/mdipierro/web2py-recipes-source/tree/master/source/04_advanced_forms/06_Creating_a_Form_Wizard App is here: https://github.com/mdipierro/web2py-recipes-source/blob/master/apps/04_advanced_forms/web2py.app.form_wizard.w2p --
