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WriteProfString()
Write a string into an entry in WIN.INI
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Syntax
WriteProfString( <cSection>, <cEntry>, <cNewString> )   -->  lSuccess

Arguments
<cSection> is the name of a section in the WIN.INI file.

<cEntry> is the name of an entry within the <cSection> section
in WIN.INI.

<cNewString> is the string to be written in the entry.

Returns
If successful, logical TRUE (.T.) is returned, otherwise FALSE
(.F.) is returned.

Description
The file WIN.INI in the Windows directory (e.g. C:\WINDOWS) is
examined for an entry like:
          [ <cSection> ]
                   .  .  .
          <cEntry> = some_characters
and the value (here, some_characters) is changed.

If the section or entry is not found, it is created.

If <cNewString> is NIL, the entry is deleted.
If <cEntry> is NIL, the entire section is deleted.

Example
// Suppose WIN.INI contains:
//        [ClipApp]
//        level=expert
? GetProfString( "ClipApp", "level", "novice" )   // result: expert
WriteProfString( "ClipApp", "level", "novice" )
? GetProfString( "ClipApp", "level", "" )         // result: novice