How can I know the amount of free RAM when my VI is running?

I need to know the amount of free RAM when my VI is running.

If you are using Windows NT/2000/XP, monitoring free memory is very easy. Simply right click on the task bar and open the Task Manager. Click on the Performance tab, and you'll be able to monitor the physical memory total and available on your PC.
If you are using Windows 9X, you will have to add some optional resources. Open Control Panel, then select Add/Remove Programs. Click on the Windows Setup Tab, and select System Tools, then click the Details... button. Check the boxes to install System Monitor and System Resource Meter. Click OK, and you will be prompted for your Windows CD. Insert the CD and Windows will add the monitoring tools. You can then use them to watch your free resources.

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          FILENAME            = W_FNAME
          HAS_FIELD_SEPARATOR = '#'
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           WA_VA01_F-BSTKD = WA_VA01-BSTKD.
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         perform bdc_field       using 'BDC_OKCODE' '/00'.
         perform bdc_dynpro      using 'SAPMV45A' '4001'.
         perform bdc_field       using 'KUAGV-KUNNR' WA_VA01-KUNNR.
         perform bdc_field       using 'VBKD-BSTKD' WA_VA01-BSTKD.
         perform bdc_field       using 'BDC_OKCODE' '/00'.
         perform bdc_dynpro      using 'SAPMSSY0' '0120'.
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         perform bdc_field       using 'BDC_OKCODE' '=CHOO'.
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         perform bdc_field       using FN WA_VA01-KWMENG.
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         perform bdc_field       using FN WA_VA01-MABNR.
         perform bdc_dynpro      using 'SAPMV45A' '4001'.
         PERFORM bdc_field       USING 'BDC_OKCODE' '=POAN'.
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      LOOP AT MESSTAB .
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              IF err_message CS '&1'.
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                REPLACE '&2' WITH MESSTAB-MSGV2 INTO err_message.
                REPLACE '&3' WITH MESSTAB-MSGV3 INTO err_message.
                REPLACE '&4' WITH MESSTAB-MSGV4 INTO err_message.
              ELSE.
                REPLACE '&' WITH MESSTAB-MSGV1 INTO err_message.
                REPLACE '&' WITH MESSTAB-MSGV2 INTO err_message.
                REPLACE '&' WITH MESSTAB-MSGV3 INTO err_message.
                REPLACE '&' WITH MESSTAB-MSGV4 INTO err_message.
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              CONDENSE err_message.
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              WRITE: / MESSTAB.
            ENDIF.
        endif.
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    FORM BDC_DYNPRO USING PROGRAM DYNPRO.
      WA_BDCDATA-PROGRAM  = PROGRAM.
      WA_BDCDATA-DYNPRO   = DYNPRO.
      WA_BDCDATA-DYNBEGIN = 'X'.
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      CLEAR  WA_BDCDATA.
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    FORM BDC_FIELD USING FNAM FVAL.
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      WA_BDCDATA-FVAL = FVAL.
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      CLEAR  WA_BDCDATA.
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    input file :
    OR     2148     0001235     R-1162     8     17
    OR     2148     0001235     R-1161     2     30
    OR     2148     0001235     100-400     6     25
    OR     2148     0001235     R-1162     4     12
    OR     2148     0001236     R-1162     3     12
    OR     2148     0001236     R-1161     2     30
    OR     2148     0001236     100-400     1     25
    OR     2148     0001236     R-1162     7     12
    OR     2148     0001236     R-1161     8     30
    OR     2148     0001236     100-400     10     25
    OR     2148     0001235     R-1161     5     30
    OR     2148     0001235     100-400     2     25
    OR     2148     0001235     R-11621     3     12
    OR     2148     0001235     R-1161     2     30
    OR     2148     0001235     100-400     1     25
    OR     2148     0001235     R-1162     7     12
    OR     2148     0001235     R-1161     8     30
    OR     2148     0001235     100-400     10     25
    OR     2148     0001236     R-1162     8     17
    OR     2148     0001236     R-1161     2     30
    OR     2148     0001236     100-400     6     25
    OR     2148     0001236     R-1162     4     12
    OR     2148     0001236     R-1161     5     30
    OR     2148     0001236     100-400     2     25

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