updated for version 7.3.038
Problem: v:windowid isn't set on MS-Windows.
Solution: Set it to the window handle. (Chris Sutcliffe)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index d1a1ba3..bceb680 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1660,7 +1660,11 @@
*v:windowid* *windowid-variable*
v:windowid When any X11 based GUI is running or when running in a
terminal and Vim connects to the X server (|-X|) this will be
- set to the window ID. Otherwise the value is zero.
+ set to the window ID.
+ When an MS-Windows GUI is running this will be set to the
+ window handle.
+ Otherwise the value is zero.
+ Note: for windows inside Vim use |winnr()|.
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4. Builtin Functions *functions*