If the central service provider maintains the list, they can update it as often as required. If you wish to do this yourself from Mac or Windows, the Mailservers available for both platforms allow this functionality. Listservers are yet another means of having a group of people easily share mail. Simpler servers are available for Mac and Windows machines. The Talk program is fully described in the Talk section of the manual.
Talk is ideal for interactive communication via typing between two people.
I find it useful also to copy and paste sections of work in progress from my wordprocessor to the Talk program, for direct feedback from the person I am connected to. I can also copy and paste their comments or suggestions back into my wordprocessor if I wish. If you require multiway conversation between more than two people, use Internet Relay Chat IRC instead. FTP FTP sites can be used as an exchange point for documents and programs. There are several possible configurations.