Batch files contain commands in plain text that can be executed by the command line interpreter of the operating system to accomplish a specific purpose. Windows batch files usually have an extension of .bat
A DSN (database source name) file allows multiple users to connect to a database with information in a flat file. It is used by the database client program — in this case, software in the IRI Workbench — to connect to a database.
VSE, short for Virtual Storage Extended, is an operating system for IBM mainframe computers. Programs scripted in its job control language (JCL) instruct the system in how to run batch jobs or start subsystems.