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The Blackboard calculator for Windows 7-10 (x32, x64) is a very simple programming environment that uses the "Do...Until", "While ...Wend" loops, a branch construction of the type " If...ElseIf...Else...EndIf" and the keywords "Break" and "Continue". This makes it possible to implement most of the algorithms of modern computational mathematics. So with the help of the Blackboard calculator, you can, for example, numerically solve algebraic and differential equations, or approximate certain integrals, sum series, etc. The results of the calculations, which are series, can be automatically displayed as graphs. The calculator is equipped with tools for debugging formulas, in particular, it reports syntax errors and even some runtime errors. In addition, calculations can be stopped by a condition, and then they can continue or start over. Formulas can be annotated and saved to a text file for future reference. Web-based help and help in .chm format are available. If complex mathematical calculations are not needed, the Blackboard calculator can be used simply as a convenient multi-line formula calculator for home, accounting, engineering, etc. calculations. In this case, the Blackboard calculator can be considered as an alternative to the Windows calculator.