append-to-buffer function will be used interactively,
the function must have an
interactive expression. (For a
interactive, see section Make a Function Interactive.) The expression reads as follows:
(interactive "BAppend to buffer: \nr")
This expression has an argument inside of quotation marks and that argument has two parts, separated by `\n'.
The first part is `BAppend to buffer: '. Here, the `B'
tells Emacs to ask for the name of the buffer that will be passed to the
function. Emacs will ask for the name by prompting the user in the
minibuffer, using the string following the `B', which is the string
`Append to buffer: '. Emacs then binds the variable
in the function's argument list to the specified buffer.
The newline, `\n', separates the first part of the argument from
the second part. It is followed by an `r' that tells Emacs to bind
the two arguments that follow the symbol
buffer in the function's
argument list (that is,
end) to the values of
point and mark.
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