Questions: xCAS engine

[compsystems]

Hello,

Xcas project eng home page https://www-fourier.ujf-grenoble.fr/~parisse/giac.html




QUESTIONS
1: The Xcas engine also includes or is integrated to programming language? or is a separate application

2: How is called this language on Xcas? for example on the HP-prime is call it HP-PPL "HP-Prime Programming Language"
if no name yet, I suggest calling "Xcas-L", must have a name to reference from a paper

3: Where can I find english documentation (only operating language)
https://www-fourier.ujf-grenoble.fr/~par...index.html FRN =(

or at least one english document full programming in hp-prime

4: What are the differences between the language of CAS HP-PRIME (HP-PPL) and Xcas