'This file is an annotated version of sysdefs.
Comments (by Dan Ingalls and Diana Merry) are in string-quotes like this.
The code portion of this file is copyright Xerox Corp. 1974'
The bootstrap process sets up a global dictionary. It then reads input lines,
looking specifically for the defining word, "to", and calling its code directly
.'
'Now definitions can be made by evaluating "to" in ST code'
'Read input into a vector. The bootstrap reader is almost identical in function
to the SMALLTALK read routine, except that DOIT is signalled by <CR> at zero-th
parenthesis level, and single-quote strings are ignored.'
'This defines the eval method (and more that will be described later) for code
vectors.'
'This is the top-level user program. Its class variables also serve as the
global symbol table (also known in the interpreter as TopLev).'
As soon as USER has been defined (ie from here on), it provides the code to
execute in each cycle of Smalltalk execution.'