MOON
Server: Apache/2.2.31 (Unix) mod_ssl/2.2.31 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4
System: Linux csr818.wilogic.com 2.6.18-419.el5xen #1 SMP Fri Feb 24 22:50:37 UTC 2017 x86_64
User: digitals (531)
PHP: 5.4.45
Disabled: NONE
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File: //var/usr/webmin-1.941/mon/README
Readme file of webmin module for Mon 
created on 10th Sept 2001 

TO install..
Untar the file from / directory with root previliages.
Add this module in the webmin-user module access list
You can add entry"mon" in /etc/webmin/webmin.acl or use webmin to append user module access list.