I have a low transaction volume server running on an ADSL connection. As the server uses PHP and MySQL (on a Linux distro) I need to have sufficient processing power there for the very little traffic it handles - it needs to be responsive.  I therefore am running a 1.8GHz Duron processor.  Most of the time the machine is idling.  If I install the SETI client I want it to stop processing whenever anything else requires the processor (or at least be very low priority) - I don't want a degradation of speed serving pages.  Is the priority set as being low and how easy is it to install on Debian?  The APT package did not work when I tried yesterday.  Also are there any security considerations I should be aware of?

TIA,
RT