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There are thousand of ways to achieve this, probably the last recommendable one is a cookie. Assuming that by a security point of view there is no issue or you managed it, app A just need to expose a dedicated servlet or even just a callback.zul file:

<window>
<zscript><![CDATA[
    String id = execution.getParameter("id");
]]></zscript>
<label value="${id}"/>

</window>

so when in app B the user push the "select" button you have just to redirect to callback.zul?id=123. In callback.zul you are back to your app A and with the selected ID you can do what you have to do.

I repeat: the cookie was the last option... this is just a possible (stupid) other way to manage your scenario.

There are thousand thousand of ways to achieve this, probably the last recommendable one is a cookie. A stupid straight forward one? Assuming that by a security point of view there is no issue or you managed it, app A just need to expose a dedicated servlet or even just a callback.zul file:

<window>
<zscript><![CDATA[
    String id = execution.getParameter("id");
]]></zscript>
<label value="${id}"/>

</window>

so when in app B the user push the "select" button you have just to redirect to callback.zul?id=123. In callback.zul you are back to your app A and with the selected ID you can do what you have to do.

I repeat: the cookie was the last option... this is just a possible (stupid) other way to manage your scenario.

There are thousand of ways to achieve this, probably the last recommendable one is a cookie. cookie.

A stupid straight forward one?

<window>
<zscript><![CDATA[
    String id = execution.getParameter("id");
]]></zscript>
<label value="${id}"/>