Reading two parameters passed to an Applescript Studio Application

I need a count down timer for a Filemaker DBMS solution. Obviously I can’t use FM for this. I intend using the Applescript Studio Count Down Timer example but need to pass to it the start and end times from FM.

After searching this forum and googling around 20 pages I can’t find hints on how to read parameters passed to an Applescript Studio Application.

I know this may be reasonably easy - can someone please point me in the right direction. (I know how to do this in native Applescript).

Cheers
MacP