Barbara, Here is some "input", or responses to your e-mail access questions: 1. All of the on-line services that you mention, plus several others have toll-free phone no.'s for information and are happy to send literature describing their services, including e-mail activities. In fact, the 3 major vendors of these services offer an introductory 5 or 10 hours of on-line time to new customers. After these free hours are depleted, typical costs are about $10 per month, with 5 "free" hours per month, and about $3 per hour after that. 2. The only needs required for access to our list-server are hardware. Specifically, a modem. The modem costs keep coming down. The last check that I made indicated that a 2400 baud modem was available for about $50, and for the higher speed, 14,400 baud units about $100. The on-line services provider will supply, at no extra costs, the software needed to go between the modem-equipped PC and the on-line service provider. 3. How about using our info exchange capabilities to accumulate a data base of "environmental factors" to which our participants have been exposed, e.g. toxic chemicals, etc.? It would be interesting to look for apparent correlations between such exposures and PD incidence. Bye for now! Milton McLain