One can view and download manuals with instructions and explanations. It is material taken from the network and translated into the language of interest, such a very useful manual in English (USA) to 'build professional websites' translated in part, but simplified and adapted to avoid redundancies and repetitions so frequent in the manuals written by people with not too tidy ideas.

I invite you particularly to send material to be published, because otherwise the content of this section will not be many, as for now I'm alone to work as a hobby. If freely you give freely also you get ....

Who sends material will be quoted as specified in the 'disclaimer' and listed as author. It is not allowed anonymous material. 'See the section disclaimer'

Note: we have two types of menu on this page

1. upper horizontal menu in gray background - it contains the classes of the arguments. By clicking the respective entry is made to appear on the left a vertical menu with boxes of blue background.
2. vertical menu on the left with boxes - it contains the items entries for each class of chosen subjects .