For an Intel® Parallel Studio XE 2011 suite a license seat represents only one allowed usage for all components.
It means that if all the licenses are consumed by one component users (e.g., VTune™ Amplifier XE),
then other components can't be used (e.g., Composer XE).
For example, one 5 seats Intel® Parallel Studio XE 2011 floating license allow only 5 uses of any component, total.
The same behavior is for borrowing feature - the entire suite is borrowed as a whole, not just a one component.
Please also find this article for more details about license checkout and check in.