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1995-09-19
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VRXDA v1.2 Distributed Connection Object for VX-REXX
The VRXDA Distributed Connection Object allows you to create true
Client/Server applications with VX-REXX version 2.1 or greater. It
is a VX-REXX object developed using the ODK from WATCOM inc. and
SOM-1 and is automatically installed on the VX-REXX tooolbar. The
VRXDA Distributed Connection Object is fully enabled for drag drop
programming and will install a set of programming macros in your
VX-REXX system directory.
The Distibuted Connection Object hides the complexity of the supported
communication protocols.
Several methods of interprocess and cross-network communication are
available for OS/2. However, each has a different programming interface.
This means that a programmer must learn different ways to accomplish the
same task, depending on the protocol in use.
Using IBM* Distributed Application/2 services The Distibuted Connection
Object provides a single, consistent programming interface to aall of the
supported communication protocols. The programmer must therefore learn only
one interface in order to use multiple protocols.
Ordinarily, the programmer must decide when writing an application which
communication protocol to use. If it becomes necessary to change protocols,
the application must be rewritten.
Because the Distibuted Connection Object uses the same APIs regardless of
the underlying protocol, the selection of protocol need not be made until
run time. This means that the protocol can be changed without access to
source code and without recompiling.
This also means that a distributed application can be developed and tested
first on a single machine using OS/2 named pipes and later moved to span a
network using NetBIOS or APPC without recoding.
The Distibuted Connection Object supports three communication protocols:
o Named pipes : A form of OS/2 interprocess communication that uses
file-system calls to transfer data between processes
running on the same workstation. Named-pipes
connections across a network are not supported.
o NetBIOS : A communications programming interface that supports
peer-to-peer connections between applications running
on a LAN.
o APPC : Advanced Program-to-Program Communication, an
implementation of the IBM* Systems Network Architecture
(SNA) LU 6.2 protocol. APPC allows distribution of
applications across an SNA network.
The VRXDA Distributed Connection Object is shareware and can be registered
through the Shareware Registration database GO SWREG reg No 7276.
ADD Consulting (CH) 1995/08/25