In this article, we discuss how to write a conformational letter, look at sample templates for formal and informal confirmation letters and share some tips. The Court of Common Pleas of Allegheny County (Fifth Judicial District) consists of the following divisions:.After completing your online application, you will be assigned a confirmation number. The application process for adults, 18 years of age and older, is provided on the Welcome. Letter in the "MATP Application Packet for Adults. Complete the registration form using your institutional email address (allegheny. The application process for children, under 18 years of age, is provided on the Welcome. Letter in the "MATP Application Packet for Minors. Discover what a confirmation letter is, how to write one in five simple steps and informal and formal letter templates and samples. The vault has a lock-out switch to select either the linear accelerator or the HDR.