>>CursorFill is only needed once. After you set the value of your parameter, just call the CursorRefresh() to fill the cursor. This is equivalent to the REQUERY() function for views. There is no need to worry about NoDataOnLoad or my lNoDataOnLoad property with CursorRefresh().
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>But what happens if I change the Select command thus changing the stru of the cursor (under program control). Will the CursorRefresh() use the new changed Select CMD or what?

If the SELECT changes, then yes you have to call CursorFill again. CursorRefresh() is only designed for parameter changes in the WHERE clause.