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PP_EXPTYPE()
Return the expiration type
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Syntax
  PP_EXPTYPE()  .  cString

Returns
  " " for error, or one of the following <N>one, <E>xe count,
  <D>emo, <P>ayments.

Description
  Retrieves the expiration type from the control file.  If the
  control file or the data in it is corrupted, a " " is returned.

Example

Set up some global flags
Is this an execution limit version?  If it is, set the flag EXE_LIMIT
to .T. for use later in the program.

exe_limit=( pp_exptype() = "E" )