BEE is object-oriented and allow encapsulation of algorithmic complexity into an object which can be "inherited" and "extended" by other objects that is specialised for a particular process.

Unlike in the Object-Oriented world that a "class" is a template of an "object" and an "object" is an instance of a "class", in BEE terminology, "class" is "object" and "object" is "class".

As you are aware, some classes carry special meaning and functions.  They are called System Classes and Special Classes:

n        System Classes:

class
cookie
file
form
scheme
session
sys
text
upload

n        Special Classes:

arg
message
param
result
status
systemp

The above names must not be used as a user defined class (object).  For details, please refer to BEE Script User Reference - PDF.