Arduino+Infrared Proximity Sensor+VB6

Hi,
I'm new with the Arduino and I want to interface it with vb6 (with IR Sensor connected to the analog input). The idea is when the sensor detects an object or something, a form will pop up. How will the VB6 receive the signal from the sensor? Thaaaaaanks!

How will the VB6 receive the signal from the sensor?

It won't. The Arduino will monitor the sensor. The Arduino can send data to the serial port when it detects that an event of interest has occurred.

The VB app can monitor the same serial port, and do whatever it needs to do, based on the serial data that the Arduino sends.