--- a/windows.rst	Fri Sep 16 00:56:37 2011 +0300
+++ b/windows.rst	Fri Sep 16 01:13:06 2011 +0300
@@ -431,9 +431,9 @@
 
   cmd> icacls /setowner <Username> /t /c
 
-Recursively grand full access::
+Recursively grand full access for everyone::
 
-  cmd> icacls %dir% /t /grant:r desktop\user:(f)
+  cmd> icacls %dir% /t /grant:r S-1-1-0:(f)
 
 Well-known security identifiers (SID).
 ======================================
@@ -481,3 +481,11 @@
   http://en.wikipedia.org/wiki/Security_Identifier
                 Security Identifier
 
+Converting SID to names and inside out.
+=======================================
+
+Use 'PsGetSid' utility from Sysinternals::
+
+  cmd> PsGetSid S-1-3-0
+  cmd> PsGetSid "\NULL SID"
+