Externally referenced procedures located in executable library
files (XLs) are normally bound to your program when it is first
loaded at process creation (load time). MPE XL enables you to
bind and load a specified XL procedure any time during
process execution (run time), a feature referred to as dynamic
loading.
You might, for example, decide to do this for a large procedure
used optionally and infrequently by your program, or for a
procedure whose name is not known by your program at load
time.
