The following will give you the user name...
CurrentUser()
What do you mean by the number of login attempts? This session? Since the
password was created? In either case, this is not tracked. I don't believe
there would be any way to do this. You could create a table and store the
number of successful logins by your users each time the database is opened,
but I don't know what value that would have for you. If the user fails to
login, then nothing is logged to indicate that as far as I know.