Hi,
The same comm port can't be open by two applications simultaneously. One way is closing port each time when it not used (.PortOpen = False) and resolve conflicts between applications manually. Another way is creating out-of-process COM server with MultiUse instancing and global MSComm control for all objects. This server will handle communications of all apps depending on your requirements.

>Does any one know if it is possible for two applications to share the same comm port?
>If so, then how would I do this?
>Could you please include some sample code?