Palm OS®: The operating system of your Treo phone. A trademark of PalmSource, Palm OS is known for its simplicity of use and for the large number of applications that can be added to your Treo.
palmOne™ Quick Install: The component on your Windows computer that enables you to install Palm OS applications and other information on your Treo.
Phone/Send 
: The application on your Treo that provides quick access to the most commonly used applications on your Treo.
PIM (personal information manager): A genre of software that includes applications such as Palm Desktop software, Microsoft Outlook, Lotus Notes, and ACT!. PIMs generally store contacts, schedules, tasks, and memos.
PIN (personal identification number): The
PUK (PIN unlock key): A special extended password assigned to your SIM card. If you enter the wrong PIN more than three times, your SIM will be blocked, and you must call Cingular Wireless for the PUK.
SIM (Subscriber Identity Module): The smartcard, inserted in your Treo, that contains your Global System for Mobile Communications (GSM) mobile account information. SIM cards are portable between GSM phones – your mobile subscriber information moves to whatever phone houses the SIM.
SMS (Short Messaging Service): The service that exchanges short text messages almost instantly between mobile phones. These messages can usually include up to 160 characters. Treo phones can send and receive text messages while you are on a voice call.
Username: The name associated with your Treo that distinguishes it from other Palm Powered® devices. When you first synchronize your Treo, you are asked to give it a username.