SNAP-IX 3270 User's Guide - 4.2 Controlling Display Sessions

4.2 Controlling Display Sessions

To control display sessions, from the main screen, pull down the Control menu and select Display Sessions.

The dialog box shown in Control Display Sessions Dialog Box, is displayed.

Control Display Sessions Dialog Box

The list box lists all the display sessions configured for you; you may have up to ten sessions configured. The following list describes the information contained in the Control Display Sessions dialog box.

Long Name

The unique identifier for each session. For instructions for changing this option, see Customizing Display Sessions.

LU / Pool

Identifies the 3270 LU or LU pool that is used by the session.To change this session to use a different LU or LU pool, choose <Remap>. For more information, see Remapping a Display Session.

Node Name

The name of the SNAP-IX node on which the LU is configured. If the session is disabled or has not yet found an LU in the pool to which it is assigned, this field is blank.

LS Name

The name of the LS (link station) from the SNAP-IX node to the remote system. If the session is disabled or has not yet found an LU in the pool to which it is assigned, this field is blank.

LS Type

The type of LS. Possible values are synchronous data link control (SDLC), X.25, or token ring (TR). If the session is disabled or has not yet found an LU in the pool to which it is assigned, this field is blank.

Status

Indicates whether the session is ready to communicate with the host or is already communicating. To conduct terminal emulation or to transfer files using the session, you must enable it. To enable a session, highlight it and choose <Change Status>. For more information, see Enabling and Disabling a Printer Session. The following list describes the possible Status messages.

Disabled

Session is not communicating with the local node. To conduct terminal emulation or to transfer files using this session, you must enable it by highlighting it and choosing <Change Status>.

Enabled nnn

Session is communicating with the local node but not with a host control program.The variable nnn is the communications check code, displayed as

-+z_nnn

on the status line of the 3270 session. The code indicates why the 3270 emulation program has not yet established communications with the host. Status Line Information, explains communications check codes.

The status can also appear as

Enabled

without a communications check code for a few seconds before it changes to

SSCP

SSCP

Session has established communications with the host, but is not yet communicating with a host application.

Host_application_name

Session is communicating with the named host application.

The Control Display Sessions dialog box provides the following push buttons:

<Make Current>

Choose this to make the highlighted session current, so that it is the session you go to first when you begin or resume 3270 emulation. You can make a session current only if it is enabled and if its screen model is one that your terminal can display. If you try to make a disabled session current, a message box warns you that you cannot. In that case, acknowledge the message by choosing <Exit Message> in the message box and then enable the session before making it current. For more information about message boxes, see Message Boxes. For more information about enabling sessions and current sessions, see Enabling a Display Session, and Making a Session Current.

<Change Status>

Choose this to enable a disabled session or to disable an enabled or active session. An active session is one that is communicating with the host. In the Control Display Sessions dialog box. An active session's status appears as

SSCP

or the name of a host application. For more information, see Enabling a Display Session.

<Remap>

Choose this to change the LU that is mapped to the highlighted session. For more information, see Remapping a Display Session. This option is not selectable if the session is active, or if your System Administrator has not given you permission to remap sessions.

<Done>

Choose this when you have finished controlling display sessions.

4.2.1 Enabling a Display Session

You can conduct 3270 emulation only on an active session (an enabled session that is communicating with the host). To enable a session, use the following procedure:

Select a disabled session in the list box.
Choose <Change Status>.

Enabling a session causes the Status message to change from
```
Disabled
```
to
```
Enabled
```
. When the session is made the current session, the Status message will change to
```
SSCP
```
, and when you have logged on to the host, to the name of the host application. The session is made the current session automatically if it is the first enabled session; otherwise, choose <Make Current>. (The
```
SSCP
```
status message may take some time to appear if the LS to the host has not already been started when you enable the session.)
If this is the first session enabled, the 3270 emulation display appears in the current screen window. A new screen window is created for each additional session you enable.

4.2.2 Making a Session Current

The current session is the one you move to when you press Esc at the main screen (or choose Return to Emulator from the File menu). You must enable a session before making it current.

If a session uses a screen model that your terminal cannot display (for example, if your terminal has a 24 x 80 screen and the session uses Model 4, which is 43 x 80), you can enable the session, but you cannot make it the current session because it cannot be displayed on the screen when you return to emulation. (You can still access the session using a HLLAPI application, even though you cannot display it on the screen.)

The Motif program does not restrict the screen models that can be displayed, so you can make any session the current session.

To make a session current, use the following procedure:

Select an enabled session in the list box.
Choose <Make Current>. Three asterisks (
```
***
```
) mark the session as current.

If you disable the current session, the next enabled display session (with a screen model that can be displayed) becomes the current session automatically. If no display sessions with suitable screen models are enabled, no session is current.

4.2.3 Disabling a Session

To disable an enabled session, highlight the session in the Control Display Sessions dialog box and choose <Change Status>. Status changes to

Disabled

If you try to disable an active display session, the emulation program will ask you whether you want to deactivate the session. The session must be deactivated before it can be disabled.

4.2.4 Remapping a Display Session

The Control Display Sessions dialog box shows the name of the 3270 LU or LU pool that each 3270 session uses. If your System Administrator has configured this option for you, you can remap the session to use a different LU or LU pool. The session must be disabled before you can remap it; the <Remap> push button is not selectable unless the session is disabled. If the session is disabled but the <Remap> push button is still not selectable, your System Administrator has not given you permission to remap sessions.

To remap a display session, use the following procedure:

Select a disabled session in the list box.
Choose <Remap>.

The Remap Display Session dialog box is displayed, as shown in Remap Display Session Dialog Box.

Remap Display Session Dialog Box

The list box shows all the display LUs and LU pools you can remap sessions to.
Select the new LU or LU pool for this session from the list box.
Choose <OK>, or <Cancel> to abandon remapping the session.

If you remap the session to an LU or pool that uses a screen model that your terminal cannot display (for example, if the LU is Model 3, 32 x 80, and your terminal has a 24 x 80 screen), then you will not be able to use the session for 3270 emulation. However, you can still use it for file transfer or for running HLLAPI applications.