Is it possible to auto register on an ASP/PHP website using a script or bot?

I have a website community that consists of 3 different software solutions for the visitors to use, but they each require a seperate register and login.  The login part is no big deal, but to have to register on each of the 3 areas (solutions) is not good for business.  Single sign-on would be best, but would require a complete rewrite of the membership areas of each of the 3 solutions to use a common database.  Instead, if I could create a generic registration page that includes all of the fields from each registration form of the 3 solutions.  The idea would be for the user to register once on that generic page, then once he/she clicks submit, the script or bot or whatever it was, would execute an automatic registration on each of the 3 solutions on behalf of that user.  I would of course have to turn off CAPTCHA on each registration form except the generic one.  

Does this sound doable?  The whole reason for CAPTCHA was to keep bots from registering, so it sounds like the solution already exist, I need help moving in the right direction.  I have 2 ASP and 1 PHP solution hosted on 2 different servers.  I have no programming experience, just web and IT experience, so I would need a turnkey solution, or someone I could pay to complete this task.