Ask the XMosaic WWW browser to load URL.
Default to the URL around or before point. The strings in variable
`browse-url-mosaic-arguments' are also passed to Mosaic and the
program is invoked according to the variable
`browse-url-mosaic-program'.
When called interactively, if variable `browse-url-new-window-flag' is
non-nil, load the document in a new Mosaic window, otherwise use a
random existing one. A non-nil interactive prefix argument reverses
the effect of `browse-url-new-window-flag'.
When called non-interactively, optional second argument NEW-WINDOW is
used instead of `browse-url-new-window-flag'.
(fn URL &optional NEW-WINDOW)