Purpose: to discuss what a spreadsheet is, and to point to some
of the Tcl/Tk examples of this construct.

What is a spreadsheet?  A spreadsheet in the physical world is a piece
of paper with a ''grid'' of boxes drawn on it, used to attempt to convey
in some fashion a relationship between at least two vectors of information.
These vectors are typically referred to as ''rows'' and ''columns'' of data,
and the basic unit of information for the spreadsheet, the intersection of
a row and column, is a ''cell'' of data.

For instance, the vectors may represent columns of months/weeks/days/hours and
rows of data (money spent, sales achieved per individual, etc.).  

Electronically, one of the early spreadsheets was Visicalc.  It provided
more than just an input grid for one to type in numbers and words.
It also provided the means to associate calculations (known as
formula) to specific cells, and even link ranges of cells to a specific
formula.


Several spreadsheets coded in [Tcl] are publicly available:
   * [tiny spreadsheet]
   * [Mark Smith]'s spreadsheet [widget] [http://www.7bsoftware.com/software/ss.tgz] (dead link...)
   * [A little spreadsheet]


Other spreadsheets with Tcl associations include:

   * [Abacus]
   * [Moodss]
   * [iGecko]
   * [Infocetera]
   * [NExS]
   * [Siag Office]
   * [tk# (aka tknum)]
   * [XESS Tk interface]

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[AM] The way spreadsheets work (with formulae for a cell that reference other cells) made me think of developing a different kind of programming: [Demand-driven computation]

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[Category Glossary]