In addition to running as an applet, it can be launched via Java Web Start, or you can just download and run the JAR file directly.
There is also a Palm OS version available.
When the user begins entering a number into the X register, the stack is pushed up. That is, the previous contents of the X register moves into the Y register, the previous contents of Y moves into Z and so on. For example, the table below shows what happens when the user inputs the number 5:
| Register | Initial State | Final State |
| T | 4 | 3 |
| Z | 3 | 2 |
| Y | 2 | 1 |
| X | 1 | 5 |
When a binary operator key (+, -, *, /, yx) is pressed, the X and the Y register are combined to produce a result. This result is stored in the X register and the stack rolls down. The Y register now contains what was in Z and Z contains what was in T. T remains unchanged. For example, if the plus key were pressed the stack would change as shown below:
| Register | Initial State | Final State |
| T | 1 | 1 |
| Z | 2 | 1 |
| Y | 3 | 2 |
| X | 4 | 7 |
Unary operators, such as sin and cos, replace the value of the X register with the result of the operation. The other registers remain unchanged.
The Enter key copies X into Y and pushes the stack up so that the previous Y goes into Z and so on as illustrated below.
| Register | Initial State | Final State |
| T | 1 | 2 |
| Z | 2 | 3 |
| Y | 3 | 4 |
| X | 4 | 4 |
| Key | Function | Inverse | Keyboard Shortcut |
| ex | Raise e to the power x | Natural log of x | |
| 10x | Raise 10 to the power x | Common log of x | |
| yx | Exponentiation | ^ | |
| 1/x | Reciprical | ||
| CHS | Change Sign | n | |
| Pi | The constant PI | p | |
| sin | sine | arcsine | s |
| cos | cosine | arccosine | c |
| tan | tangent | arctangent | t |
| EEX | exponent for sci notation | e | |
| x2 | square | square root | |
| Rv | Roll stack down | r | |
| x:y | Swap x and y registers | x | |
| <-- | Back space, clear X | backspace | |
| Enter | Push X on stack | Retrieve last X value | enter |
| DRG | Select angle mode | d | |
| INV | Select inverse function | i | |
| STO | Store | ||
| RCL | Recall | ||
| x! | Factorial | ! | |
| / | Division | / | |
| * | Multiplication | * | |
| - | Subtraction | - | |
| + | Addition | + |
This calculator has 20 storage registers that can be accessed through the STO and RCL keys. To store a number in register R0-R9 press STO followed by the number of the register. For example, to store the current X register in R5, press STO 5. To recall R5 press RCL 5.
To access registers R10-R19 press the decimal point just prior to a digit. For example, to store in register R16, press STO . 6 . To recall register R16 press RCL . 6.
Arithmetic operations can be performed on each of the storage registers by pressing an operator key just after STO. For example to add the current value of the X (display) register to register R5 press STO + 5. This can be done with addition, subtraction, multiplication and division.