T-Mobile TM1393 - Manual (Page 57)

Section 1, page 53
Tips
Ending Programs
For quick access to your favorite programs, your device keeps the programs you
use running in the background. To free up memory, end programs running in the
background; otherwise, you may experience freezing and memory failures when
multiple programs run in the background for an extended period.
You must end running programs in the Task manager. To end:
1. On the Home screen, select Start > More > More > Task Manager.
2. Scroll to the application you want to close.
3. Select Menu > Stop.
To close all running programs, select Menu > Stop All.