Board Descriptions - Using HTML or PHP code?

[ToeJam]

Can HTML or PHP be used when defining the description of a board?  The reason I'm asking is... I'd like to reference the most recent post of the category within the description field if it's possible.  Is there a 'tag' that gets assigned to the most recent post of a category to point to so it's always current?

[xenovanis]

For as far as I know you can use basic html in the description field. Not sure about php though.