- ...actions
- In one well-publicized case, a change in America
Online usage pricing caused many users to stay connected longer,
allegedly resulting in a barrage of busy signals that prompted a
lawsuit by dissatisfied customers [Ano97].
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- ...capacity.
- This is
not to say that ISPs have no incentive for limiting usage even when
capacity is not reached. For instance, ISPs could limit usage
expecting that the market will support higher prices for increased
usage. This is orthogonal to the concerns of this paper.
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- ...HREF="node2.html#connected">1.
- No similar data can be
plotted for the AT&T Labs trace since no disconnection
information is available. The set of connected users for that trace
depends on the disconnection policy used.
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- ...space,
- The recency space is the total ordering of
pages according to how recently they were last referenced.
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- ...now.
- If the user has never been idle for as long as
now, a reasonable guess for the total idle time is twice the
current idle time (i.e., an LRU-like estimate can be employed: the
user's predicted future idle time is the same as her past idle time).
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- ...lists.
- The
procedure for maintaining k lists,
is
simple but we outline it here for completeness. Each list has an
update operation that takes an idle time parameter. The update
operation for the entire data structure (all lists) calls the update
operation for the first list, 
, with parameter t, when the
user becomes active after being idle for time t. The update
operation for list i examines all elements of list 
in order
from the beginning of the list. For each element 
, if
e < t, the element is removed from list i and if i < k, the
update operation is called on list i+1 with parameter e. Finally,
t is inserted in list .
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- ...servers
- There is no
established term for the devices that manage and implement Internet
protocols over multiple serial ports. Depending on the exact
functionality and marketing decisions of each maker, these are called
modem servers, remote access servers, terminal
servers, or communications servers
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