Each module placed in a library by the IEBIMAGE utility has a 4-character system-assigned prefix as the first part of its name. These prefixes are described inMaintaining the SYS1.IMAGELIB Data Set .

You can assign a 1- to 4-character identifier (name) to the module you create by using the NAME control statement in the operation group you use to build the module. If the module is a library character set, the ID assigned to it must be exactly 2 characters. Each of those characters must be within the range 0 through 9, and A through F; the second character must represent an odd hexadecimal digit. However, the combinations X'7F' and X'FF' are not allowed. Except for library character set modules, this identifier is used in the JCL, the SETPRT macro instruction, or the character arrangement table to identify the module to be loaded.

While IEBIMAGE refers only to the 1- to 4-character name or the 2-character ID (the suffix) that is appended to the prefix, the full name must be used when using other utilities (such as IEBPTPCH or IEHPROGM).