1.  With Pc Calculator the creation of the user defined functions is easy. Each of the memory lines is actually also a function, which can be executed with the line function £ or a quote function ". Here is a collection of hyperbolic functions, which take their parameters from the register @.  2.  You can add explanatory comments anywhere into the memory. Here is the beginning of formulas, which calculate the date of the easter sunday for the year in the register y.  
3. 
The size of the calculators working memory is 2000 lines and each line can be even 2000 characters long.
When you start the program, it opens from the same place where the cursor
was, when the program was previously closed. If you want to find some specific
place in the memory, you can use programs find command Altf. From the version 4.2 onward you can also divide your work to different task books and open them directly from inside of the program. 
4.  This screenshot is from the version 3.5. Here the cursor is on the line V=494. If the code is somewhere else, you need only to give a new value to V accordingly. In the version 4.0 you could also use the symbolic memory addressing.  5.  Here the coefficient values start from the line U=489. They could be anywhere in the memory, if only U on the line V points to them. 
3.  This was the landing place of the previous screenshot's find command. Note that this example is obsolete, because the matrix inversion is much more simple to use. You only need to write down the matrix of the equation coefficients and take the inverse of it. Move the cursor over the picture to see. 
Advanced properties
If you can calculate something on the paper, so you can with Pc Calculator but only much faster. Find here an example how refraction integral is calculated with Pc Calculator. This is a program for you, If you, for instance, want to know, how far away a refraction raised horizon is. What makes PcCalculator unique?

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