A
TTN
Key
The ATTN (Attention) key performs the function that its name implies;
that
is,
it provides a means
of
getting the program's attention. The ATTN key
is
op-
erative only
when].
is
displayed in the Operator Information Area;
if
the
ATTN key
is
pressed when
.a
is
displayed in the Operator Information Area,
the Minus Function (
)(
- f ) message comes on in the Operator Information
Area.
While your display station
is
signaling the program, the Time (
)(
:./: )
mes-
sage comes
on
in the Operator Information Area, disabling your keyboard.
Most programs, when responding
to
this key,
turn
off
the Time message.
How-
ever, this is up
to
the program. The program
that
is
operating in the host system
at the time determines how the ATTN key
is
used.
If
you are not familiar with
the program's response
to
an ATTN key depression, ask the appropriate person
in
your
organization about the program's response or refer
to
the appropriate
user's program guide.
SYS
REQ
Key
The SYS REQ (System Request) key
is
an
alternate function key and can be
used only when you are holding the ALT key down. The function
that
this
key performs depends upon whether an
.a.
or a
].
symbol
is
displayed in
the
Operator Information Area.
When the
.a
symbol
is
displayed in the Operator Information Area, pressing
the
SYS REQ key (with the ALT key held down) sends a unique signal to the
host system to tell the program
that
your display station may be failing and that
you have keyed a test request message. If you are
not
familiar with the Request
for Test procedures, ask the appropriate person in your organization about the
procedures.
When the
B symbol
is
displayed in the Operator Information Area, pressing
the
SYS REQ key (with
the
ALT key held down) (1) causes your display screen
to
be cleared and (2) switches your display station between application and con-
trol programs. Ask
the
appropriate person in your organization for an explana-
tion
of
the use
of
the
SYS
REQ key when
~
is
displayed or refer
to
the
appropriate user's program guide.
3·32
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