Is APEX the tool for a lightweight browser based query only front end?

I'm tasked with prototyping a lightweight browser based front end to display consolidated customer information. It needs to be callable from half a dozen disparate and mostly non-Oracle applications, each passing in a customer id parameter. In my mind I've already marked-down the only front-end tool I have experience of - Forms10g as being too resource intensive to be continually started up and closed down (plus the initial potential JVM download to locked-down PC's). That leaves me with a couple of options (as far as I can see) - APEX or ADF Faces. I'm slightly worried about the steep learning curve for a J2EE environment plus the possible compatibility issues with ie 5.5 ( I know, I know ). And finally, my question - I've got a good feeling about it but does APEX seem like a good fit for this sort of task?

It needs to be callable from half a dozen disparate and mostly non-Oracle applications, each passing in a customer id parameter. Chris - They want to be able to hit a button in these other applications and see a browser window pop-up (quickly!), view the customer details (composite picture sourced from a data warehouse) then close the browser window and go back to their app. Needs to be lightweight for speed so APEX seemed a good idea.
Denes - Thanks. I'm thinking that the users will regularly open this browser session from their app then close the APEX window to return - probably time and time again. Did you find that establishing a connection and getting the page up made it slow. Is there something I should concentrate on to make sure that aspect performs?

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