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PP_UNLOCK()
Unlock the program (from date/exe expiration)
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Syntax
  PP_UNLOCK()  .  lResult

Returns
  .T. if successful, else .F.

Description
  Updates the control file to make the expiration type "N" for
  none and empties the expiration date field.  This is most
  commonly found as one of the hidden user-codes.  Upon the
  completion of payment from your client, you may unlock him
  from any type of expiration type (either date or exe counts).
  This leaves all copy protection intact.  Refer to "Commonly
  Asked Questions" on page  for more information about
  application limiting and unlocking versus copy protection.
  Refer to PP_UCODE() to see how to integrate this function as
  a user-code.

Example

if pp_unlock()
    @ 2,0 say "Application unlocked..."
endif