====== JRE Upd ======
  * use web service
  * client requests latest update downloads update over http
  * update is stored as a single jar/tar file
  * web service jsp based
  * used mysql database
  * updater uses OS version to determine correct update e.g.(Windows XP/Windows 7)

===== update dir structure =====
  * install.reg -> changes to the registry merged after install (regedit -s)
  * jre8/jre7 plugin runtime (copied to Program Files\Java Plugin)
  * version.txt -> contains version info
  * destpath.txt -> intended install location

===== Web Service =====
  * check_update.jsp client sends OS version replies with "NULL" or update version e.g. "1.8.25a"
  * get_update.jsp client sends requested version either gets "NULL" or download URL.


===== Update Client =====
  * c# based
  * client knows the current plugin version
  * client performs a GET with a PLATFORM arg of "Windows 7" to check_update.jsp
  * if client gets a version that is not equal to current version it performs a GET with arg of VERSION and PLATFORM to get_update.jsp
  * if client gets a url client downloads update and installs it to Program Files\Java Plugin, merges install.reg, and stores version.txt in Program Files\Java Plugin


===== Database schema =====
==== Updates Table ====
  * update_id (int)
  * version(str) e.g. (1.8.25a)
  * supported_platforms(str) e.g. (Windows 7;Windows 8;Windows XP)
  * url (str)
  * post_date (timestamp)
  * seq (int)
  * enabled (boolean)

==== Users ====
  * user_id (int)
  * username (str)
  * password (str)
  * level (int)