When was extended call syntax introduced?

[Edward K. Ream]

Various documentation pages, e.g.
http://www.python.org/doc/2.3.3/lib/non-essential-built-in-funcs.html
state that the apply function has been deprecated since 2.3.

Can anyone tell me when extended call syntax was actually introduced? 
Neither googling nor brief checks of the 'What's new in Python' or the pep's 
has turned up this information.  Thanks.

Edward
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