I read your request for information on accessing bibliographic
databases through the Internet. All of the databases you
mentioned (and more) are available through a service called the
Life Science Network. This service is very easy-to-use, is
available through the Internet, and has a flat-rate pricing
structure so you can track expenses to stay within your budget.
You need to send for a User Agreement in order to get a password
to the service. (There is no charge to receive a password.)
E-mail to: BIOSIS at A1.RELAY.UPENN.EDU
I hope this helps.