The binder and program objects ease or eliminate many restrictions of the linkage editor and load modules. The linkage editor limited aliases to 64 and external names to 32767. With the binder, the number of aliases and external names for programs stored in a PDSE or z/OS UNIX file is limited only by the space available to store them.
For program objects, external names (those entry points in one section that can be referenced from another section or module or from the operating system) can be up to 32767 bytes in length. Long names can be used for section names, external labels and references, pseudoregisters and common areas, and (limited to 1024 bytes) aliases and alternate entry points for the module. Primary or member names are still limited to eight bytes, however, as are member names appearing in JCL or system macros. For z/OS UNIX-resident program objects, z/OS UNIX name length restrictions apply.