The error code generated by the last command that returned an error code.
A number (1 to 9999). Can be reset by an application program.
The reason for the failure of the most recently executed command that returned an error code other than 0 (success)
At the beginning of each application session, $LastErrCode is set to $Null. Its value then changes only if a command returns an error code, or the application program explicitly assigns it a new value.
Explanations for many error codes are contained in the ErrorHelp entity set, which you can access from your database application using the DESCERR or EXPLERR utility program.