NetIndexOn (cFile,cKey,[bKey],[lUnique],[lContinue]) --> true/false:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Functions:
~~~~~~~~~~
Functional variant of NET INDEX ON command, decribed in command chapter

Parameter description:
~~~~~~~~~~~~~~~~~~~~~~
cFile:     index file to create
cKey:      index key in form of string
bKey:      index key as a code block, if nothing is set the function
           creates it
lUnique:   sets the index to unique, if nothing set the value is taken
           from system SET UNIQUE ON/OFF
lContinue: if true, it can continue whether the index creation failed
           or no

Return value:
~~~~~~~~~~~~~
true if index file was created, false if no

Source code is in file  Object3.prg