r3 does not record the last used form. If you open r3, it will show you the home page. If you then click on an application, it will direct the user the start form (either the default start form, or one based on the user role).
A user can always open a specific form though, if they use the corresponding URL.
For the next feature release, we are also looking at offering functions to be started when a user opens r3, so for your purposes it would not matter, which form is opened. For our own apps, we receive all user specific data via collections - so far we had no need to otherwise initialize data for specific users.