Best place to put cffunctions?

I've created a cffunction which I need to access more or less from every page. Where is the best place to put it? Can I put it in the Application.cfc? If yes how, and how can I call it from a page?

If it's just one function, then just put it in your Application.cfc.  Provided you have an onRequest handler specified, then all Application.cfc's functions are exposed to the calling template via the variables scope.  So if you have myFunction() defined in Application.cfc, you simply call it as

<cfset a = myFunction()>

If you have a bunch of functions which can be organised into a library, then you could stick 'em in a CFC, instantiate that in onApplicationStart, putting it in the application scope, and perhaps consider creating a variables-scoped reference to it in onRequest, for ease of calling.

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Adam

My suggestion is to write the function in a separate cfc.  Then, in your onSessionStart function, create an object with that cfc.  That allows you to call the function with session.objectname.functionname()

Should you write any more udf's later, put them in the same cfc and everything will work.