yes
The employee ID number would be on your copy of the W-2 that you should have in your hand before filing your income tax return. You should be able to get the number by contacting the company if you are an employee or former employee.
A former employee is a non employee. You can discuss what you want.
A former employee is a person who used to work for the company but no longer do. This includes those that were let go or that quit on their own.
File a complaint with who and for what? A former employer can be sued. If they signed documents when they came to work for an employer and later violated the agreements be they secrecy agreements or whatever then violated the agreements of course they can be held liable in civil court for these violations.
I would imagine that you are wondering if you can be sued for slander if you speak critically of a former employee. Generally speaking, it is legal to speak the truth. If you were planning to tell lies about your former employee, that could get you into trouble.
How would you describe the quantity and quality of output generated by the former employee
It depends on what she or he said. When a Manager or Supervisor calls your former employee for a reference, they are suppose to ask your former employee will you hire this person again, your former employee only suppose to say Yes or No.
No. An employee, whether current or former, cannot use your medical record without your consent.
no
A current employee is still employed by that particular employer; a former employee is not.
yes
ADP pension information for former employee 121927