This parameter specifies a Java "attachment class" to load immediately after the Reflection terminal session is done loading.
Java attachment classes are a feature of the Reflection Emulator Class Library (ECL) that allow Java code to attach to the currently running terminal session and perform automated tasks. If you write your own Java attachment class, it must be packaged into a user archive file, and the userArchive parameter must be used to specify the name of the archive file. If you use an attachment class built into Reflection, you do not need to add the userArchive parameter when specifying a startup Java class. Java attachment classes must implement the interface ECLAppletInterface.
Value
<a fully qualified Java class name>
Example