A family of Microsoft relational database management systems designed for ease of use.
You can use:
DoCmd.SendObject acSendForm
I'm not a big fan of emailing forms - they tend to have a lot of non-essential stuff on them. I would rather create a report.
No PK? Sounds ominous.
The fact that you did not create this database has little bearing on anything as far as I am concerned. If this is your assignment, you make the best of it. If you see things that should be improved, you can discuss with your manager.