The $# RHS operator serves two functions. The
first is to select a delivery agent, the second is to return the
status of a policy-checking rule set. We cover the first in this
section and the second in the next.
When used as a prefix to the RHS or a rule set (except when used in a
policy-checking rule set), the $# operator is used
to select a delivery agent. Consider, for example, the following
R$+ $#local $: $1
Here, the LHS looks for a workspace that contains a username (without
a host part). If such a workspace is found, the RHS is then used to
select a delivery agent for that user. The selection of a delivery
agent is signaled by the $# prefix to the RHS. The
symbolic name of the delivery agent is set to
local. The $: operator in the
RHS is described in $:.
The $# in the RHS must be used as a prefix or it
loses its special meaning. See Section 18.7.5 for a
full description of this operator.