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RASExpress User Guide

4 CommPlete Communications Server

How RASExpress Works with LANs and Data

Communications

A RASExpress server allows you to share modem services on a LAN. Services are

shared by running a redirector program on the client PC that allows the user to

connect to and log onto the RASExpress server. The DOS version of this program is a

terminate-and-stay-resident (TSR) program, which runs in the background until it is

required.

The DOS redirector used with RASExpress is MCSIWSN.EXE. The Windows version

is WinMCSI. When run by a user at a client PC, MCSIWSN requests all active

communications servers to broadcast their presence on the LAN. After MCSIWSN

loads, the user logs onto the RASExpress server by typing logon, a user name, and an

optional password. The user can then run data communication software from the

DOS prompt.

To dial out through the RASExpress server, the user runs the redirector, enters the

user name and password, runs the communications software, and selects an available

modem. The modem operates just as if it were connected directly to the user’s PC.

To dial in for remote control, a remote caller dials one of the RASExpress server mo-

dems. The RASExpress server displays a List of Hosts screen from which the remote

caller can select a host. The remote caller then types a password, if one is required.

The remote caller then is connected through the RASExpress server to a client PC that

is running a remote control communications program.

To dial in for a remote node session, a remote caller goes through a similar procedure.

Redirectors

A redirector allows a communications program on a client PC to use the RASExpress

server’s communications lines as if they were local modems. A software redirector,

such as MCSIWSN for DOS (for IPX networks) or WinMCSI for Windows (for IPX or

TCP/IP networks), is installed in a client PC. MCSIWSN can be used with any LAN

data communications software that has a MCSI-compatible interface (INT6B ACS

API). WinMCSI is used with any data communications software that supports COM1

through COM8 .

LAN Operation with RASExpress

Using any of the RASExpress configuration utilities, the system administrator can

name the RASExpress server, assign user access privileges, and configure each port

for operation. User privileges are established by assigning user names and passwords

to users (limited only by the amount of RAM), and then specifying which users are to

have access to which modem ports.

For a client PC on the LAN to use the RASExpress server, it must run a redirector

program such as WinMCSI. The redirector program works with a communications

program to redirect asynchronous data to one of the RASExpress server’s communi-

cations lines. When the asynchronous data is redirected, it is converted into LAN

packets for routing to the RASExpress server (outbound operation), or it is received

as packets from the LAN and converted to asynchronous data for the communica-

tions program (inbound operation).

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