Hi,
You can drill from reports created in Query Studio, Analysis Studio, PowerPlay Studio and Report Studio to anything that runs in the Cognos Viewer or to any target page the web server can access.
There are some limitations to when values can be passed, however. For example, if you drill from a report written against one vendor's cube to a report written against another vendor's cube, the MUN values will be different, so parameters will not tie up.
The drill-through definitions can either be defined from Cognos Connection (Launch -> Drill Through Definitions) for use in any studio, and/or they an be explicitly defined in Report Studio reports.
Regards,
MF.