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  1. Gdbm_Fetch
  2. #Parent Gdbm_
  3. =>    R0 =    file handle from <Gdbm_Open> or <Gdbm_OpenIn>
  4.     R1 =    pointer to keyword
  5.     R2 =    length of keyword
  6.     R3 =    buffer for data
  7.     R4 =    length of buffer
  8. <=    R0 =    length of data read, or 0 if key not found
  9.  
  10. Retrieves data filed under a keyword in the database.