updated for version 7.3.031
Problem: Can't pass the X window ID to another application.
Solution: Add v:windowid. (Christian J. Robinson, Lech Lorens)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index f8ac272..d37fe2a 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1657,6 +1657,11 @@
*v:warningmsg* *warningmsg-variable*
v:warningmsg Last given warning message. It's allowed to set this variable.
+ *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.
+
==============================================================================
4. Builtin Functions *functions*