You'll have to search for man pages. Most packages have had the man pages stripped out to save space.
I don't use them myself, but there are several discussions about man pages here on the forum. If you search for the packagename with "man" you may find the man pages for that particular package.
If it is a regular Linux package, you can find man pages on the net.
Sharp proprietary packages should have a user manual somewhere. Look in the SL 6000 general forum for those. I posted the PDF user manuals for the SL-6000 software, which is very similar or the same as other models software.
For commandline commands man files, you can find them on the net also.