The multilingual lessons are based on the use of international signs. They are explained here:http://www.web07.yogote.net/pxs_informativas/3infoI.htm

You can use a dictionary to look for the sign for a certain idea:

In English: http://www.web07.yogote.net/Diccionarios/Selectores/SelectIng.htm

In Spanish: http://www.web07.yogote.net/Diccionarios/Selectores/SelectSpa.htm

In French: http://www.web07.yogote.net/Diccionarios/Selectores/SelectFra.htm

In Portuguese: http://www.web07.yogote.net/Diccionarios/Selectores/SelectPor.htm

In German:http://www.web07.yogote.net/Diccionarios/Selectores/SelectDeu.htm

The international signs are written by signograms, that are very easy to read and understand how to do the sign by yourself. The signograms are made by three kind of lines, that bear the following information:

Position and point of view

Look here for more explanations with images:  http://poesiamerica.yogote.net/index.php?option=com_content&view=article&id=127&Itemid=89

Form of the hand

More explanations here:  http://poesiamerica.yogote.net/index.php?option=com_content&view=article&id=128&Itemid=90

Movement 

Explanations with animation and video: http://poesiamerica.yogote.net/index.php?option=com_content&view=article&id=128&Itemid=90