$ \textbf{hg qapplied}
first.patch
second.patch
$ \textbf{hg log -r qbase:qtip}
changeset:   
tag:         first.patch
tag:         qbase
user:        Bryan O'Sullivan <bos@serpentine.com>

summary:     patch queue: first.patch

changeset:   
tag:         qtip
tag:         second.patch
tag:         tip
user:        Bryan O'Sullivan <bos@serpentine.com>

summary:     patch queue: second.patch

$ \textbf{hg export second.patch}
# HG changeset patch
# User Bryan O'Sullivan <bos@serpentine.com>

# Node ID 
# Parent  
patch queue: second.patch

diff -r  -r  other.c


@@ -0,0 +1,1 @@
+double u;