Asynchrone clients?

[Eduard Witteveen]

Hello,

Does anyone know a asynchrone (opensource) web-clients that retrieve 
gisdata?
I would like to use a client that keeps retrieving data from the area , 
but in which you can also click / pan / zoom in the meantime(with 
keeping already loaded vector data).

If i would have to implement it i know it can be done by using the 
"google" way of retrieving square's of data. Is there also a way to make 
a streaming sollution with mapserver, or should i write my own server 
using GDAL directly..(fetch objects around a certain coordinate with 
((distance to coordinate) * area) as order for which one to send first)

Any thoughts?

-- 
Ing. Eduard Yeb Witteveen           Software Engineer
Hawar Information Technology bv   lid Dijkoraad Groep
De Wymerts 7  8701 WT                        Bolsward
Tel: +31 (0)515 570333         Fax: +31 (0)515 570335
http://www.hawarit.com/             nl_NL fy_NL en_US