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RET_ERRFUN()
   Returns the Flipper function code.

   Syntax
         nFunctionCode = RET_ERRFUN()

   Arguments
         None

   Returns
         nFunctionCode  Returns the Flipper function code for the last error.

   Description
         RET_ERRFUN() returns the Flipper function code for the last error.
         The function code is returned to 0 after the call is made. See the
         table for a description of function codes.
  +------------------------------------------------------------------------+
  |Error Function Codes                                                    |
  -------------------------------------------------------------------------|
  |Code|Function  |Code|Function  |Code|Function      |Code|Function       |
  |----+----------+----+----------+----+--------------+----+---------------|
  |  1 |FSCREEN   | 26 |REGRESS   | 51 |PIC_GET       | 76 |General Printer|
  |  2 |FPOINT    | 27 |ATX       | 52 |PIC_PUT       | 77 |HP_UNITS       |
  |  3 |FPSET     | 28 |ATY       | 53 |VIEW_OPEN     | 78 |GET Function   |
  |  4 |FLINE     | 29 |SET_AREA  | 54 |VIEW_CLOSE    | 79 |OBJECT Function|
  |  5 |FBOX      | 30 |ABS_TO_X  | 55 |VIEW_CLEAR    | 80 |BUTTON Function|
  |  6 |FPOLYLINE | 31 |ABS_TO_Y  | 56 |VIEW_SWAP     | 81 |MENU Function  |
  |  7 |PAINTAREA | 32 |LEGEND_SAY| 57 |VIEW_MOVE     | 82 |SAVEBACK       |
  |  8 |PAINT     | 33 |ADD_SCALE | 58 |VIEW_FLOPEN   | 83 |PCX            |
  |  9 |FILLAREA  | 34 |GRAPHMODE | 59 |FONT_ALIGN    | 84 |PLOT           |
  | 10 |FDRAW     | 35 |SET_COLOR | 60 |FONT_COLOR    | 85 |STORE_VAL      |
  | 11 |WORLDSET  | 36 |SET_PAL   | 61 |FONT_MAGNI    | 86 |SPLINE         |
  | 12 |SINE      | 37 |POLYFIT   | 62 |FONT_ROTAT    | 87 |Boundary Fill  |
  | 13 |COSINE    | 38 |SET_AXIS  | 63 |FONT_UNDERLINE| 88 |Trim Memory    |
  | 14 |ARCTANGENT| 39 |SET_COLUMN| 64 |GET_FONT_ATTR | 89 |HP_PLOTTER     |
  | 15 |FLP_MALLOC| 40 |SET_GRAPH | 65 |FONT_SIZE     | 90 |PS_PLOTTER     |
  | 16 |MEM_MODE  | 41 |LEGENG_SET| 66 |FONT_OPEN     | 91 |ScanJet Error  |
  | 17 |FLIP_INIT | 42 |FPIC_OPEN | 67 |FONT_CLOSE    | 92 |Screen Driver  |
  | 18 |INITDATA  | 43 |FPIC_CLOSE| 68 |FONT_NEW      | 93 |Mouse Function |
  | 19 |AXIS_LOG  | 44 |FPIC_PUT  | 69 |FONT_SPACE    | 94 |Scroll Bar     |
  | 20 |PIE       | 45 |FPIC_GET  | 70 |LINE_DIR      | 95 |3-D Function   |
  | 21 |P_SCALE   | 46 |FPIC_READ | 71 |LINE_JUST     | 96 |Virtual Memory |
  | 22 |X_SCALE   | 47 |FPIC_WRITE| 72 |Low Level Font| 97 |Mesh 3-D Error |
  | 23 |Y_SCALE   | 48 |FPIC_CREAT| 73 |Print Font    |    |               |
  | 24 |STORE_DATA| 49 |FPIC_DEL  | 74 |PRT_LOAD      |    |               |
  | 25 |QRETRIEVE | 50 |FPIC_PACK | 75 |Esc Sequence  |    |               |
  +------------------------------------------------------------------------+