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Single User mode has capabilities that are even more limited than run level 1.
Among those limitations are -- no network connectivity and no logins for users other than root.
See the following page in the Solaris 10 System Administration Guide :
which can be found here:
Therefore I think your task for patching will require someone to be at the box while you do that maintenance.
If you have a system with a ILOM or system controller configured with
an IP address, OR have your serial console connected to a Network Terminal Server, yes.
I'd say a majority of systems are installed and maintained remotely these days,
and that includes patching, reboots . . .anything you don't actually NEED to be
there for (like connecting/checking cables or LEDS).
telnet will drop it's connection upon reboot.