We are trying to use wide area network to connect to different

OI servers on various sites. We have got all the networking

applications we need to implement the decision making /dialling

process failure recovery etc.

As part of this we need to be able to inform the user of various

events like when connected/disconnecte to the remote site etc. Also

in order to log on the remote network we need to be able to

pass user name/password from OI to our application. The

OS is NT 4.0.

Bearing in mind that most of the networking is done in Win32

(because of NT) it seems the best way of exchanging data between our OI app. and network app to be through DDE.

To implement this we have some questions

1)Has anyone got a sample code for using DDE under OI.

Do you know of problems associated with this under OI ?

2) Also we need to send and receive user defined

MS Window messages. Ie above WM_USER.

But there is no information that clearly states the safe range

of MS Window message that we can use under OI. I say

this because it is highly likely that OI developers would have used some user defined window messages. Obviously we need to avoid sending conflicting messages. Does anyone know

from what value we can define our own Window Messages ?

Thanking you in advance.

Regards

F. Farid/Yaw Ansah

F. Farid/Y. Ansah,

In general, the following steps are followed when using remote networking with OpenInsight:

1) Program files and dictionaries (i.e. all static data) are installed at each remote site so they do not have to be transfered each time;

2) Data files and indexes (i.e. all shared dynamic data) are installed at the central site;

3) The central site runs the NLM or NT Service to minimize the size and number of requests from the remote sites;

Another alternative that some customers use is the WinFrame (now MetaFrame) product from Citrix. This runs the app centrally and sends just the UI over the dial up connections.

Cameron Purdy

Revelation Software

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