A hash that unique identifies exception.
This is a full BugID value.
BugID is a 4-byte unsigned integer (LongWord) which is used to identify exception. Two exception with the same BugID value are considered to be the same. BugID is used to establish uniqueness for many EurekaLog features (such as "Do not save duplicate exceptions", etc.). BugID is also used by EurekaLog Viewer tool when importing exceptions from multiple bug report files to eliminate duplicates. Two bug reports are considered to be duplicates of each other if they are bug reports about exceptions with the same BugID.
BugID consists of two parts. Hi-word is defined by EurekaLog. Lo-word is not used by EurekaLog and it's left for your customization.
Hi-word of BugID is a CRC16 value of string (" BugID ident") which includes application and module identification, exception class and two lines from call stack. "BugID ident" does not include exception message and exact error location (address). Only human-readable names are taken from call stack (unit name, class name and routine name). Thus, BugID will not change when you rebuild your application.
You can alter BugID (either by appending custom lo-word or fully replace it) in OnCustomBugID event handler.