<FRAME SRC="xxx.htm" NAME="main">
This is how most of us have identified frames. It provides no cues to a visitor with assistive technologies.
<FRAME SRC="xxx.htm" NAME="main" TITLE="Navigation Menu"">
This is how we should identify frames. It works both for browser and assistive technology navigation.
<FRAME SRC="xxx.htm" TITLE="abc"">
This will also work with assistive technologies, but may cause graphical browsers to get lost. Without the Name element you will find it hard to target links from one frame to another.