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\DOC open_win
\TYPE {open_win : (path -> (window -> window) -> window -> window)}
\SYNOPSIS
Apply some transformation to a subwindow of a window.
\LIBRARY window
\DESCRIBE
{open_win path fn win} opens a subwindow in the focus of {win} at the
position described by {path}.
The window transforming function {fn} is then applied to the resulting
subwindow.
The subwindow is then closed and the transformed parent window returned as
the result.
\FAILURE
{open_win path fn win} will fail if {path} describes a position which
is not present in the focus of {win}.
\EXAMPLE
{
# transform "(==>) (A /\ (B /\ F))" [] []
# (
# open_win [RAND]
# (
# rewrite_win []
# )
# );;
|- A /\ F ==> A /\ B /\ F
}
\SEEALSO
OPEN_WIN, CLOSE_WIN, open_context, OPEN_CONTEXT, establish, ESTABLISH,
gen_open_win, GEN_OPEN_WIN
\ENDDOC
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