How do I connect from a machine with a dynamic IP address?

This is not possible for the moment!
For example, a personal PC which does not have a fixed IP address, connected via an ADSL liaison, cannot be integrated into the IDRIS filters.

There is a solution for circumventing this problem:
If you can access a machine which is registered in the IDRIS filters (for example, in your laboratory), you can connect via this intermediary machine to the Adapp pre/post-processing front-end machine or to the front-end machines of the Ada and/or Turing computers.
In this way, you will be able to work at IDRIS.