Java is a programming language and computing platform first released by Sun Microsystems in 1995. There are lots of applications and websites that will not work unless you have Java installed, and more are created every day.
IIS is able to impersonate the IUSR_<computername> account because the user name and password for this account are known by IIS. Before returning a page to the client, IIS checks NTFS file and directory permissions to see if the IUSR_<computername> account is allowed access to the file.
In the MyERAS application, applicants generate a Letter Request Form (LRF) for each LoR they are requesting and they provide the relevant author with the form. Authors and/or their designees use the unique Letter ID on each form to upload LoRs for applicants. A designee may not be a member of the hospital in an advising role or medical school staff supporting in the application process. To access the LoRP, you will need an AAMC account.