best practice for writing optional code

[Yvon Henel]

hello all (?)

it seems that this list is not very active but perhaps there is somebody 
to read my message :)

I would like to create an auctex style file to provide help for one of 
my LaTeX package.

My problem is that the LaTeX package has options which determine which 
LaTeX commands will be available in the document.

Is there a best practice to do so? Are there already some functions for 
ensuring that a certain option has been passed to a LaTeX package?

any hint will be greatly appreciated

all the best

--
Yvon Henel