All ASTERIX logicals are prefixed by "AST'137 ". The logical pointing to a particular directory is of the form 'AST'137 (directory abbreviation)' e.g. the directory [ASTERIX.EXE] is pointed to by AST_EXE, the directory [ASTERIX.SOURCE.EXOSAT] has the logical AST_EXO. Some of these logicals are set up when ASTERIX is entered, and more are added by ASTDEV. For a list of those currently defined, type "SHO LOG AST_*".