There were some fields in the system object that were commented out in R3-Alpha. Generally speaking, these don't belong in the core any longer.
Some pertained to the console:
;console: make object! [
; hide-types: _ ; types not to print
; history: _ ; Log of user inputs
; keys: _ ; Keymap for special key
; prompt: {>> } ; Specifies the prompt
; result: {== } ; Specifies result
; escape: {(escape)} ; Indicates an escape
; busy: {|/-\} ; Spinner for network progress
; tab-size: 4 ; default tab size
; break: true ; whether escape breaks or not
;]
Or the command line:
; trace: ; True if the --trace flag was specified
; help: _ ; True if the --help flags was specified
; halt: _ ; halt after script
There was more, though. For email:
; email: make object! [ ; Email header object
; To:
; CC:
; BCC:
; From:
; Reply-To:
; Date:
; Subject:
; Return-Path:
; Organization:
; Message-Id:
; Comment:
; X-REBOL:
; MIME-Version:
; Content-Type:
; Content:
; _
; ]
The Network:
;network: make object! [
; host: "" ; Host name of the user's computer
; host-address: 0.0.0.0 ; Host computer's TCP-IP address
; trace: _
;]
And a bunch of... other stuff. Continuing in the spirit of "not just keeping things around any more", I'm just putting it here. There are a lot of considerations about how any system should manage global state, but hanging on to a file of mostly random words that are all commented out isn't making much of an inroad on that.
; decimal: #"." ; The character used as the decimal point in decimal and money vals
; sig-digits: _ ; Significant digits to use for decimals ; blank for normal printing
; date-sep: #"-" ; The character used as the date separator
; date-month-num: false ; True if months are displayed as numbers; False for names
; time-sep: #":" ; The character used as the time separator
; browser-type: 0
;
; model: ; Network, File, Driver
; type: ; bytes, integers, values
; user: ; User data
; host:
; port-id:
; user:
; pass:
; target:
; path:
; proxy:
; access:
; allow:
; buffer-size:
; limit:
; handler:
; status:
; size:
; date:
; sub-port:
; locals:
; state:
; timeout:
; local-ip:
; local-service:
; remote-service:
; last-remote-service:
; direction:
; key:
; strength:
; algorithm:
; block-chaining:
; init-vector:
; padding:
; async-modes:
; remote-ip:
; local-port:
; remote-port:
; backlog:
; device:
; speed:
; data-bits:
; parity:
; stop-bits:
; _
; rts-cts: true
; user-data:
; awake:
; port-flags: make object! [
; direct:
; pass-thru:
; open-append:
; open-new:
; _
; ]