Click the wrench icon on VoiceAttack's main window, then on the "General" tab of the VoiceAttack options window enable the "Minimize to System Tray" option, click "OK", click "OK", then restart VoiceAttack.
Press F1 while VoiceAttack has focus to open VoiceAttackHelp.pdf in your default PDF viewer, which contains information on VoiceAttack's features.