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 twCalculator( nT, nL, cColor, cwSType, cwFType, lOKPaste )
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     Display a calculator with memory and optionally allow pasting the
     result into a get.

     The calculator performs the usual addition, subtraction,
     multiplication, division as well as square root, percent and
     additive inverse of an entry.

     The memory allows the four basic operations to be performed on its
     contents as well as clearing and recalling to the current entry.

     This calculator may be moved about the screen with the cursor
     keys. When exited, it will appear again where it was on exit.
     Also, both the current total and the memory are retained for the
     next use.

     The operational registers and memory must be cleared separately.

       Arguments:

     nT, nL   - 'N' Relative screen coordinates to begin the calculator
                    display. These will be updated if you move it.

     cColor   - 'C' Clipper colour string. YOU MUST PASS A COMPLETE
                    string, eg., "w/b,gr+/r,,,n/w" The default is the
                    current window colour.

     cwSType   - 'N' TSDWIN Shadow type. Defaults to the current shadow
                    type.

     cwFType   - 'N' TSDWIN Frame type. Defaults to the current frame
                    type.

     lOKPaste - 'L' Logical to allow pasting to gets.


       Return:

     NIL

       Example:

     twCalculator()