Local rules shall not require the filing of discovery. Any party serving discovery shall file a certificate of service of discovery document.{Amended April 22, 2013}. Download and complete Proof of Delivery forms from the Illinois Office of the Courts. Discovery is used to gather information from another party in your case. Learn how and when to use it. All forms below with a "fillable icon" are documents that you can open "on-line", fill in the appropriate fields and then print on your printer. You can file for divorce in the county in which you reside or the county in which your spouse resides. Formal Discovery is the process of obtaining information from the other party. Notice. If you are hearing impaired and have filed a case, the Court is able to provide a sign language interpreter for court proceedings only.