When the assembler encounters the LIB directive, it temporarily stops reading the code from memory and instead reads one line at a time from the named file. Processing of the in-memory source resumes after either an end of file or an END command is encountered in the LIB file. Turn off by pressing return on a blank line, Default step value is 10. Any line containing the string will be listed on screen. Only for SEQ files.
Default start is first line.
Useful when checking labels or converting between number bases.