Hi there,
If you have SDK installed and depending on your language preference (programmatically speaking - JAVA, Csharp etc) there is an example under the ../<C8Install>/sdk/<JAVA>/schedule folder
There are also a fair number of technotes on this issue as well. I cant add any URL's at the moment because I wont be able to view the response for some reason in Cognoise. Not sure which side is causing it but just do a search in goolge using
IBM Cognos SDK Schedule
Hope this helps
Cheers
Peter B