"USCIS has expanded the services offered by our e-Request system. This Web-based tool allows customers to inquire about applications and petitions submitted to USCIS. On November 19, customers will see the following enhancements to e-Request:
Create a service request for all forms to either inquire about the status of your application or petition if it is outside of the normal processing time OR notify USCIS about an administrative error in a notice or document we sent you.
For Forms I-90 and N-400 only, inquire about an Application Support Center appointment notice or other notice you were expecting to receive.
Accessibility to individuals with disabilities (section 508 compliant).
To submit an e-Request, please visit our USCIS e-Request home page and have your receipt number available." - USCIS, Nov. 19, 2012.