A .rhosts-like file controls which clients are 'trusted hosts'.
A "commands" file controls which commands are accepted from clients.
You can refresh the server's list of supported client hosts without restarting the server.
You can refresh the server's list of supported command classes without restarting the server.
On the vms client side, you can change which unix machines handle which command classes by redefining logical names and don't need to restart the scp (see below for the meaning of the word 'class'.
Note:
This was a restriction on the 1.0 release that needs to be tested for 1.1... There is currently a restriction in the specification of unix command options. Only single word qualifiers starting with "-" are supported. (eg "-cfg filename" is NOT a supported command option). A workaround is to put the command with the two word option in a script file on unix and to execute that instead of executing the command directly.