Regardless of the setting
of MSTORED, the macro facility first searches for macros compiled
in the current SAS session. If the MSTORED option is in effect, the
macro facility next searches the libraries containing compiled stored
macros. If the MAUTOSOURCE option is in effect, the macro facility
next searches the autocall libraries. Then, the macro facility searches
the SASMACR catalog in the SASHELP library.