As you know, you can perform calculations directly in the document window with Atlantis.
Let's take a sum of numbers as an example.
The simplest case is when the numbers are placed on separate paragraphs as illustrated in the following screen capture (note that the numbers are followed by paragraph end marks. These are special non-printing symbols, visible only when the "View | Special Symbols" mode is on):
This is achieved by typing the numbers, and pressing Enter after entering each separate number.
As a next step, you should select the target numbers with the mouse or keyboard:
The calculation is done by pressing the Alt= hot key, or by clicking the corresponding toolbar button:
If all the selected numbers are proper numbers, Atlantis will automatically place their sum onto the Windows clipboard. The calculated sum can then be pasted in any document.
Now the numbers might be surrounded by additional text:
In this case, the numbers have to be selected separately from the surrounding text. Simply hold the Alt key down while you select the numbers as a column block with the mouse cursor:
Then press the Alt= hot key or click the corresponding toolbar button to send the calculated sum to the Windows clipboard.
There is a third possibility: the numbers might be scattered over a whole page or even a whole document. In such cases, the numbers must be selected as a so-called multiple selection:
Select the first number in any usual way - with the mouse or keyboard (a double click on the number seems to be the easiest).
Then press and hold the Ctrl key down, and select the remaining numbers with the mouse.
Finally, press the Alt= hot key or click the corresponding toolbar button to send the calculated sum to the Windows clipboard.