One can use System.Object datatype to hold any values.
Typically you will use text controls for user-input data, but you can also use date-pickers, lists and combos, radio controls, check boxes and custom controls to accept user-input in a more controlled manner.
Command Line Interface
A data loader is software that allows for the automated import, export, and storage of Salesforce data in large volumes. A data loader is used to import, export, and delete an unlimited amount of data for your business in a quick and secure manner. A Salesforce data loader is a universal tool used for bulk importing and exporting of data. It provides a user-friendly UI or command line access. A data loader can input, update, and completely delete large amounts of Salesforce records.
There is no such HTML code.You can use JavaScript, however, to store a cookie on the users system. This bit of code can be used to store relatively small amounts of data, but allows for tracking the user and some related user data determined by the programmer from page to page.
to create user defined functions the user defined data is needed nd its useful to the programmer to create its own data.
The primary example of a hardware component that allows user data input is a keyboard.
Required Field
Typically you will use text controls for user-input data, but you can also use date-pickers, lists and combos, radio controls, check boxes and custom controls to accept user-input in a more controlled manner.
Control Panel
A User Interface controls how you enter data and instructions and how information is displayed on the screen.
A prompt
If you override the User Account Control it allows an application to be run even if the you do not have the required administrative privileges.
The program is a Spreadsheet. eg Microsoft Excel
CompareValidator
The formula bar.
data validation
Command Line Interface