PFILE from SPFILE

Hi All,
 When I created a pfile from spfile the pfile has lines like the
following....
 *.background_dump_dest='?\admin\
 I have a few doubts regarding that.
 1> Why **.* is there before each line.
 2> Why the locations of the dumps as well as the control files have
*?\*prefixed.
 3> Even when i use sho parameter control_file it shows the ?
  Please help me in understanding the above.

--
Regards,

Deepak
Oracle DBA

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