>I'm using VFP6. I have a grid bound to a table, the grid is marked read-only. Question is, if there is information in any of the cells, I'd like to change the backcolor of those cells. Grid dimensions are (10 x 71).

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Look at the dynamicbackcolor property.

You can set that to something like
iif(empty(myfield),rgb(r,b,g),rgb(r,b,g))