The routines in the sec_cred API are distinguished with names having the prefix sec_cred_.
In this API, the status error_status_ok has the value 0 and indicates
successful completion of the function the routine was called to perform.
In the few instances where successful completion is indicated by other than
error_status_ok, this other status will be explicitely called out.
For this version of DCE, there is one routine that returns successful
completion other than error_status_ok. This routine is
Background is given in