The Ident1 and Ident2 fields are unique identifiers managed by the Adonix engine for the user connection. The first is unique for a given folder. It corresponds with the result of the evaluation of the adxuid(1) function. The APLLCK file (this is the LCKPID field) also uses it.
The second is unique for a given server and service number. It corresponds with the result of the evaluation of the adxuid(2) function.