Overview
 About the String Functions:
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 This block contains a set of General string functions. All functions on this
 block have been written in Assembly and are thus quite efficient, in speed
 and in size. Quite some "useful" Clipper written string functions could
 have been added, but it is the policy to add mostly Assembly or Clipper-
 Using-Assembly functions in the Expand Library.

 As an argument, all the functions generally accept any character string up
 to 64Kb in size (Clipper's maximum). The functions never alter the original
 contents of the string (it is possible in Assembly, and a common bug), but
 always work on a local copy of the string. Internally, efficient routines
 have been designed to perform this.