what is modulo in singular?

what is the algorithm of modulo in singular?

i find no description of modulo in books

see
http://www.mathematik.uni-kl.de/~zca/Reports_on_ca/02/paper_html/node27.html
which explains modulo in terms of Groebner bases and Syzygies.

do not understand the page,

what is the algorithm of ker and Im and the arrow in ker?

what is the algorithm to calculate modulo(A,B)?

after googled, no books telling this, any simple presentation?

Lack of algorithm of modulo, can not do Hom function then can not do supersymmetric toolkit

Please check

Decker / Lossen
Computing in Algebraic Geometry
A Quick Start using SINGULAR

is modulo function equal to reduce function?

i post another post, is it correct?