>>Do you want to see how bad it can go if you use reserved names for what they are not intended? Try this

>>Create Cursor _screen (height i, width i, visible l)
>>Insert Into _screen (height, width, visible) Values (500,500,.t.)
>>Browse

>>If you are really bold, replace the second line with this

>>Insert Into _screen (height, width, visible) Values (-5000,-5000,.f.)

>
>I braced for contact but nothing happened, just a browse, what should I have seen?

Update: You actually need to change the values inside the grid, since the inserted values are overridden. Try to set the value of one of the first columns to -5000, or change the value in the third column to .F.