Libname <libref> <path>;
Libref maximum 8 characters; letters, underscore or numbers; cannot start with numbers; no special characters.
It is helpful to start a programme with a path macro: %let path=<folder path>;
To invoke the macro: libname <libref> "&path";
A macro will only be recognised if placed within double quotes
To change a libref: libname <libref> clear;