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  Function:    DelEnv()

               This Function removes an environment string from the
               environment. Sort of SetEnv(x,""), but better.

  Syntax:      DelEnv(cVar)

  Arguments:   <cVar> is the variable one wishes to remove.

  Returns:     A logical indicating the succes of the operation.

  Usage:       DelEnv('CLIPPER')
See Also: ReadEnv() SetEnv() EnvDel()
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