APEX popup from another web-application

Hello,
In an existing web-app (not developed using APEX, but using Oracle as underlying db), we are planning to add lot of APEX based pages. To start with this is what we need.
We want to write one APEX page which we want to show as POP-UP page on click of some button in the existing application.
How can this be achieved?
regards, Yora

Will you have these popup pages under any authentication or as public pages? Why exactly are you doing this mixing APEX and another web based tool??
Thank you,
Tony Miller
Webster, TX

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For each of the other apps (App B, App C, App D), I need to have 2 variable/attribute settings whose values are to be set (pre-defined) per user.
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