What third party library are you using to handle the communictions? It does not look like Silverclip. Didn't it come with some sort of help file (.NG)?
From my experiance, Windows likes to control all ports directly. Basically locking out any DOS application from manipulating them directly. There are some exceptions. Windows 95 and 98 still allow DOS apps to control the ports, but 2K, NT and XP have greater strictions in doing this.
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