Also just hold down the menu button for a bit longer than necessary to call up the menu (maybe 1-2 seconds) and all the running programs will show. You can then switch programs if so desired.
No, you will need to press the Menu Key and select Close/Exit. In most native applications and some third party applications, you can press and hold the escape (back) key and it will close out of applications.
The difference between stupidity and genius is that genius has its limits. When you take things for granted, the things you are granted, get taken. Even a mosquito doesn't get a pat on the back until it starts to work.
[GroupWise 7.0.3 / BES 4.1.6 MR 5]