> what does asynchronous imply here?

Description
http://econym.org.uk/gmap/async.htm
Implication, you can't use results until after they have returned

Cross-posted in v3 group
> You can access the code at
> http://web.iiit.ac.in/~vishal.gargug08/test/index.php

You have
   dirn1.loadFromWaypoints([p11.toUrlValue(6),p11.toUrlValue(6)],
{getPolyline:true});
   dirn2.loadFromWaypoints([p22.toUrlValue(6),p22.toUrlValue(6)],
{getPolyline:true});
These only fire off requests to Google's servers, without waiting for
a response.  So dirn1 fires, followed by dirn2, and then whatever code
comes next - but results are not yet available.

Note that there are speed limits on the rate at which you can fire
requests, to prevent abuse.  Firing multiple requests is likely to
fail.  Search this group for handling multiple requests, or
http://econym.org.uk/gmap/geomulti.htm


   var p1 = dirn1.getPolyline().getVertex(0);
There is no polyline yet.  If you want to do something with the
results from the requests, you need to listen for when they available
by setting up a 'load' event listener and using the results only in
the callback.
http://econym.org.uk/gmap/steps.htm

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