RE: Tell me about Login and password parameters in job...
PASSWORD parameter is used to identify a current RACF password or specify a new RACF password. You can specify a new password at any time and must specify a new password when your current one expires.
But I did not found any information about Login parameters.
RE: Tell me about Login and password parameters in job statement?
userid is the RACF assigned user security identification. Password is the individual unique security name assigned to the userid. Production jobs are under the security control of RACF which requires job statement parameters USER and PASSWORD to acquire authorization for execution. USER and PASSWORD parameters must be eight positions long for production jobs. Suppose your colleague is logged in and you want to submit a job from his ID and want that to be available in your spool. Then you can submit the job from his ID giving the USER and the PASSWORD parameter. The job will be available in your spool after the execution. Say you have a job where all the new datasets are to be created with Your teammates ID then you can run a job from your ID using the USER and PASSWORD of your teammate.