2 arduinos as com port loopback.

Hello,

I am trying to get bi-directional comm between a program of mine and MS powerpoint, which uses VBA. The only method that they have in common is that they both have com port libraries.
I have 2 ardinos, which i would like to tie the serial ports together and forward the usb serial commands from one arduino to the other's usb port. Is that possible? I dont know where to start. I can do complex programming on the ardino, but when it comes to serial, i am a noob.
Any help would be appreciaated. I am needing to do a presentation on Monday.

Thanks

Is that possible?

Yes

You need an application on the PC that reads one serial port and writes out to the other. You need a language to do this in, processing is a good one and it is free to download.

thanks; I have the apps already made. I was wondering about how to do it on the arduino(s) side.

All you need to do is connect TX on one to RX on the other, and vice versa. Also connect the grounds.