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(emacs-lisp-intro.info)Summing up zap-to-char

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Summing up `zap-to-char'
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   Now that we have seen how `search-forward' and `progn' work, we can
see how the `zap-to-char' function works as a whole.

   The first argument to `kill-region' is the position of the cursor
when the `zap-to-char' command is given--the value of point at that
time.  Within the `progn', the search function then moves point to just
after the zapped-to-character and `point' returns the value of this
location.  The `kill-region' function puts together these two values of
point, the first one as the beginning of the region and the second one
as the end of the region, and removes the region.

   The `progn' special form is necessary because the `kill-region'
command takes two arguments; and it would fail if `search-forward' and
`point' expressions were  written in sequence as two additional
arguments.  The `progn' expression is a single argument to
`kill-region' and returns the one value that `kill-region' needs for
its second argument.