How do you secure COM1?

I'm working with Visual C++ 4.0 and am trying to secure COM1 while my
program is being executed. I would like for no other programs to use the
COM1. Currently I am using CreateFile, ReadFile and WriteFile to set-up and
use the communications ports. I am using the SetupComm,SetTimeouts,
GetCommState and SetCommState commands. Any suggestions?

Thanks in advance.

Hi C6934 (Is this your real name ? <g>),

as long as you have the port open it is yours, no other program can
open it.
The only problem is that another app already grabbed it before your's,
then you have to inform the user.

ThomasZ [MVP]