DDS Advantages

The advantages of using DDS over UIM follow:

ŸProvides more flexibility in screen design

The user defines in what row and column a field should appear.

Ÿ

Provides

initial

formatting

with Screen Design Aid (SDA)

Ÿ

Has

the

ability

to

use

UIM help or help in folders

Ÿ

Has

the

ability

to

take

advantage of graphical operations windows

ŸDoes subfile processing

Ÿ Uses edit code (EDTCDE), edit word (EDTWRD), and user-defined edit

ŸIs faster for smaller applications

DDS requires less initial setup (that is, the display file may be ically by an HLL program).

Ÿ Can also

imbed

HyperText Markup Language (HTML) tags into the data st

that is

sent

out

Virtual Terminal APIs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The

virtual

terminal

APIs

allow

your

AS/400

 

application

programs

to

interact

AS/400 application programs that are performing

work

station

input

and

outp

(I/O).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A virtual

 

terminal

 

is

 

a device that does not have hardware associated w

forms

a

connection

between

your

application

and

AS/400

applications,

repre

a physical work station (possibly on a remote

system). The

OS/400

license

program

 

manages

the

virtual

terminal,

which

directs

work station

I/O

per

an

AS/400

application

 

to the virtual terminal. The virtual terminal

APIs

allo

another AS/400 application, calledserver program

,

to

work

with

the

data

associ-

ated

with the

virtual

terminal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In

a

distributed

systems

environment,

the

requesting clientprogram;theis

called

answering program

is

calledserver.a The

client

and

server

programs

may

reside

on

the

same

AS/400

 

system or may be distributed between two

differen

The

server

program

generally runs on behalf of (or in conjunction

with)

program. Together,

the server

program

and

the

client

program

allow

a

wor

to

be

 

supported

as

if the

work

station

were

connected

locally.

 

 

Work Management APIs

 

 

 

 

 

 

 

 

 

This

group of

APIs

helps you

to

better manage the work on your

syste

let

you

keep

track

of

the

jobs

and the things associated with

those

some

of

the

APIs

allow

you

to

adjust the performance characteristics.

Work

Station

Support

APIs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The

work

station

support

APIs

allow

you

to

control

the type-ahead chara

 

 

a work station and to retrieve information about

the

last

output operat

 

 

requester

device for

the

specified

interactive

job.

 

 

 

 

Type-ahead,

 

also

calledkeyboard

buffering,

 

lets

the

user

type

data faster

th

 

 

can

be

sent to

theAttentionsystemkey.

buffering

 

determines

how

to

process

 

 

 

the

action

of

pressing

an

Attention

key. If attention

key

buffering

is

8-28

System

API Programming V4R1

 

 

 

 

 

 

 

 

 

 

 

 

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Image 204
IBM Version 4 manual DDS Advantages, Work Management APIs, Support, Station