>>I'm using a USB to Serial converter (EdgePort) to add 24 rs-232 comm ports to a WinXP box. I can interact with all 24 ports via HyperTerminal, yet my implementation of mscomm32 only picks up the first 16 port addresses. Is this a limitation of mscomm32.ocx?
>
>Yes, it's control limitation.

Thanks (bummer)! Do you know if any of the commercially available comm controls handle port addresses above 16?