>Hi,
>
>I run GoFish and find that a function UserPrefer( 79 ) is found in several .FRX files, in the column SUPEXPR
>
>But I cannot find which text box or a label uses this function (probably in the PRINT WHEN, guess). How could I find which text box or label uses this function?
>
>TIA
>
>UPDATE. I found where this function is being used. But I would still like to know how to find it without guessing.

Use myfrx.frx
browse for atc("userprefer(", expr)>0

If it doesn't find it in expr, try other similar fields, like supexpr etc.