Did you also try to remove the "@" from the actual call? According to the FoxPro help for the error message you listed, this error occurs during the call to the DLL, not the declaration.

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>>>>This makes no sense; why would you declare one of the arguments of type & as "long @" and the other "long"? The odds are that one of the two long declares is completely FUBAR, and either both should be declared LONG, or LONG @ (LONG is ByVal, LONG @ is ByRef)
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>>>The tcpHandle needs to be modified by the called program, so I declared it as by reference. maxTime is a parameter that I would typically pass in as a constant.
>>>
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>>THe declaration is unaffected by the need to capture a changed value - you use @ in the function call to allow any change to propagate back; declaring it in the DECLARE...DLL has a definite and different effect; LONG passes a 4 byte integer, while long @ passes a pointer to what is presumed to be a 4 byte integer. See CLSHEAP to see examples of where to use each.
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>Thanks for that info, i wasn't sure what @ would signify in the DECLARE statement.
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>With that in mind, my DECLARE should be without the @. Nonetheless, I still have a problem elsewhere.