I haven't coded in VB for a long time now but it should be rather easy when you just take some source submitting using decaptcher API and exchange the domain with 127.0.0.1.
If you right click on the captcha breaker icon > open file location > there should be a .dpr file that has the API source that you need to make it work. I think you can open it with notepad and take a look. (I think) :P
Other then that the easiest way might be to set up your VB application to use a third party captcha services such as deathbycaptcha. CB can emulate these services so your software doesn't really need to integrate or support CB, it can still work.
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