FT_DFSETUP()
 Set up parameters for FT_DISPFILE()
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 Syntax

      FT_DFSETUP( <cInFile>, <nTop>, <nLeft>, <nBottom>, <nRight>, ;
               <nStart>, <nCNormal>, <nCHighlight>, <cExitKeys>,   ;
               <lBrowse>, <nColSkip>, <nRMargin>, <nBuffSize> ) -> nResult

 Arguments

        <cInFile>     - text file to display (full path and filename)
        <nTop>        - upper row of window
        <nLeft>       - left col of window
        <nBottom>     - lower row of window
        <nRight>      - right col of window
        <nStart>      - line to place highlight at startup
        <nCNormal>    - normal text color     (numeric attribute)
        <nCHighlight> - text highlight color  (numeric attribute)
        <cExitKeys>   - terminating key list  (each byte of string is a
                        key code)
        <lBrowse>     - act-like-a-browse-routine flag
        <nColSkip>    - col increment for left/right arrows
        <nRMargin>    - right margin - anything to right is truncated
        <nBuffSize>   - size of the paging buffer

 Returns

     0 if successful, FError() code if not

 Description

     Note: make sure you allocate a buffer large enough to hold enough
     data for the number of lines that you have in the window.  Use the
     following formula as a guideline:

        buffer size = (# of line) + 1 * RMargin

     This is the smallest you should make the buffer.  For normal use,
     4096 bytes is recommended

 Examples

     @ 4,9 TO 11,71

     FT_DFSETUP("test.txt", 5, 10, 10, 70, 1, 7, 15,;
                "AaBb" + Chr(143), .T., 5, 132, 4096)

     cKey = FT_DISPFILE()

     FT_DFCLOSE()

     @ 20,0 SAY "Key that terminated FT_DISPFILE() was: " + '[' + cKey + ']'

 Source: DFILE.PRG

 Author: Mike Taylor