Hi,
Its possible pass a field from a form on urls? Something equivalent to the guid ( example a field autonumber unique )
The answer of this is Yes. As you send the link, that is how you can pass a value to a field on a form. It has a guid example in the link and also for a simple example; /main.aspx?etn=lead&pagetype=entityrecord&extraqs=subject%3dtest
If you need to pass a value in an app then the example would be like /main.aspx?appid=[App Id]&pagetype=entityrecord&etn=lead&extraqs=subject%3dtest
Regards,