[Tilecache] How to query feature info with tilecache layer?

[Alphatran]

As you see, tilecache is the fast way to load map from MapServer. I'm
changing to use tilecache layer instead of WMS layer. But I'm worry about
how can I query feature info with tilecache layer?

Currently, I get feature info from WMS layer by OpenLayers.

Thanks for your attention!

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