Example application (source available on Sony Ericsson website) that shows process and thread information. 

Thread tab
A thread has a priority, with values that includes EPriorityIdle and EPriorityHigh. The request count is the request semaphore count for the thread, and the handle count is the number of handles open in the thread.

Process tab
A process has both a name and a filename. The filename is the full path name of the loaded executable on which this process is based. The process also has a priority. Three UIDs are associated with a process.

Task tab
A task can have a document with a name. For example, start the web browser and then start the procinfo example application. This will show the document name associated with the web browser. A task can be busy, a system task or a hidden task.