You can simply call addOpenFormFeedback() from your java action, also see http://apidocs.mendix.com/4/runtime/classcom11mendix11core11actionmanagement11coreaction301r01_4.html#a7b46548456e83baf102b03dbdd1fc065
Take a look at the Deeplink module in the App Store:
With the deeplink module it is possible to directly link to a specific form or microflow in your application. With this module you can configure links such as http://myapp.com/link/user/Michel http://myapp.com/link/product/22 http://myapp.com/link/resetpassword/DF6345SDF http://myapp.com/link/allusers The module is design- and runtime configurable and respects security and support links for both logged in- and anonymous users.
Here is the link: Deep link module