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

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