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3.5.2 Commands and Functions for User-Defined Functions
User-defined functions can contain just about any CoCoA command and may refer to other user-defined functions. The following are some commands that pertain particularly to functions:
Call apply a function to given arguments
Define define a function
Function return a function
Functions list the functions of a package
NewId create a new identifier
Return exit from a structured command
Var function calls by reference, other complex referencing

For details look up each item by name. Online, try ?ItemName or H.Syntax("ItemName").