The Windows Event Log can include messages organized by the following modules, and listed by Event ID, Component, Severity, and the Message String.
Servers 
ID Range 
Libraries
ID Range
  2xxx - 3xxx 1xx
  4xxx - 5xxx  2xx
  6xxx  3xx
  8xxx  4xx
10xxx 
 
Embedded Variable
Description
{DNS NAME}
Domain name, dot-separated
{IP ADDRESS}
IP address, dot-separated
{NUMBER}
Integer or decimal number
{STRING}
String of text
{HEX_NUM}
Hexadecimal number
{PNT_NUM}
Pointer to a memory address