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Host Connection Program Overview

1-3

• Supports DFT connection through the 3270 Connection Adapter. The mainframe system

console attachment using DFT is also supported. Each model can support up to four

adapters, and each adapter can have up to five active sessions for the following

interfaces:

– 3174 or 3274 Control unit

– 4361 Workstation adapter

– 9370 Workstation subsystem controller

• Supports up to 16 sessions by connecting to the IBM 5088 Graphics Channel Controller

or 6098 Channel Control Unit through the System/370 Host Interface Adapter.

• Permits more than one active session per user up to a maximum of 26 per user. (The

total number of user sessions cannot exceed the number of sessions available through

the hardware interface connections.)

• Provides extended data stream support for seven colors plus either reverse video,

underlining, or blink. The actual attribute displayed depends on the capabilities of the

display.

• Grants file transfer:

– Support for queued or immediate file transfer requests

– Support for C and FORTRAN programming interface to file transfer

• Supports industry-standard HLLAPI support using C, FORTRAN, and COBOL

languages:

– Workstation-application control of emulation session in an operatorless environment

– Workstation-application control of keystrokes in an operatorless environment

• Provides utility session support where the frequently used utilities are centralized. HCON

allows:

– Color redefinition

– Keyboard redefinition

– Session logon and logoff automatically with generation of session logon/logoff scripts

– File transfer support implicitly or explicitly

• Enables a user to interact with HCON on either a local or remote X server, or remotely by

using TCP/IP, Telnet, or remote login. When running remotely, the user must be aware

that host connection functions are executed on the “connected-to” system. The display

emulation functions are viewed where the user’s terminal is running, but other host

connection functions can run and affect files (by file transfer) and facilities (such as

printers) on the “connected-to” system rather than the local system.

• Provides support for the SNA Logical Unit (LU) pooling to improve LU resource

management and administration by:

– Monitoring a specific LU pool during peak hours to help ensure fair distribution

– Aiding to identify congested pools and low-usage pools

– Displaying the status of each LU for session management and host problem

determination

HCON’s features and connectivity capabilities are detailed in Chapter 2 “Using Host

Connection Program”on page 2-1.

National Language Support

This program includes National Language Support (NLS) for both single-byte character set

(SBCS) and double-byte character set (DBCS). Actual SBCS character presentation on

ASCII display terminals may be limited by a particular display terminal’s capability, and the

use of international names can be restricted in the customization of color and keyboard

mapping.

NLS overall characteristics include:

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