How to bypass the UAC

Ensure that your application does not need administrator priviledges. If properly written, most application can works without those priviledges except typically when the application want to update itself.

The whole point of UAC is that is should not be easy to bypass as otherwise the security would be compromise. Essentially the system prevents some global changes without the consent of the user.

By the way, why would you want to bypass it. Do you want to do do some harm on a computer? The UAC is there to prevent you to do that without the user being warned that something suspicious is occuring.