The A-Shell Shared Open Source Library ("SOSLIB") is a collection of common definitions and useful routines. They are organized into PPNs in the [907,*] range, with each PPN focusing on a particular subject or area. The library is maintained in an online repository https://bitbucket.org/microsabio/soslib where you can obtain details and downloads.
If you have been referred to a specific file, follow the link above, then "Source" in left column, then PPN, then file. We do not always provide direct links to files because the URLs change with each update.