STPrivilegedTask ask for password for each task

Question

I would like to start a lot of NSTasks that require root privilege, I found that I should use Apple's Authorization Kit and I found STPrivilegedTask, which is designed for that.

The thing is, when I start a STPrivilegedTask, it will ask me for the root password each time. Is there a way to enter the root password for the first privileged task, and then for the other tasks, the application will remember the root password, so the user won't have to enter the password again and again and again?