Can someone explain how pointers are been used?
There is no manual, directions etc. in the web and the help file is not very helpfull.

Pd-extended 43.4 includes in the [pointer] help patch (ie. /usr/lib/pd-extended/doc/5.reference/pointer-help.pd ) documentation for using the pointer object, and thereby using pointers in patches. Pointers are used to access scalars in a list, which also requires using templates and related Pd data access.