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JT, >Now I don't know, for certain, if the debugger can return the value of a >function: eval x = user_written_function(y). It doesn't, AFAIK. Which is why I don't find it odd that it won't return the value of a built-in function either. >If it doesn't, then I s'pose >it would be consistent to not allow setting of a built-in. Even in IDE's which support a command line or immediate window which allows ad hoc execution of functions, I've never seen one which allows *setting* of what a function returns. By definition, that must occur by changing the arguments to the function and/or the other data the function uses and/or the function algorithm. In this case, I suppose that means it would need to change the contents of the INFDS areas, presuming that is where the BIF's get the data. Doug
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