That may be it. Unless you are going to test the return value, there is no need for the equal sign. So, all you need is:

CursorSetProp("buffering",3,"stnhorse")

Alternatively, you could do this:

If CursorSetProp("buffering",3,"stnhorse")
else
endif

In this case, you will need an error handler. If CursorSetProp returns .F., a runtime exception will be generated.

HTH...