DeciCalc main window has a simple, user-friendly interface. Picture 1 shows main window appearance. Each control element is marked for easier reference in the text.

Picture 1. DeciCalc main window

1. Text area is designed to enter data into the calculator. It allows performing simple calculating tasks in just a few touches on the keyboard. For example, to calculate 5+6*9 You just type in 5+6*9 and press "DO" button or Enter key.
   Picture 2. Performing simple calculations
2. Virtual Keyboard is available by pressing the corresponding menu item. Virtual Keyboard can be used to enter data into the text area. Virtual Keyboard contains all available command. More information can be found in section Virtual Keyboard
3. Functions List Mode checkbox is used to activate Functions List Mode. This mode is used to create a list of functions to be graphed. For more information on Functions List Mode click here.
4. Sketch checkbox opens a small graphing window where graphing of functions can be performed. This mode is helpful when it is needed to make a quick graphing task, without entering the Functions List Mode. For more information please click here
5. Memory Control buttons are used to store and access data in calculator memory. Data from DeciCalc memory may be used anywhere in the program, including settings windows!
   Picture 3. Memory buttons
• M+ button is used to add date into memory. Just select data to be added and press M+ button. After pressing M+ button a small pop-up window will appear proposing variable name assignation. If no name for a particular variable is needed just hit Cancel button.
• LMI (Last Memory Item) button accesses the last added item.
• MM (Memory Manager) opens the Memory Manager window that allows you to access any stored item, as well as delete items.
6. Radian and Degree radio buttons change calculator settings into corresponding angle measurements mode