Autocall input processing (library search)

The library search process is also known as automatic library call, or autocall. Unresolved symbols, including unresolved DLL-type references, may have their definitions within a library member that is searched during library search processing.

The library member that is expected to contain the definition is read. This may resolve the expected symbol, and also other symbols which that library member may define. Reading in the library member may also introduce new unresolved symbols.