What is a container app in iPhone?

Our client wants us to make a container app, but I am not exactly sure what he means by this. I h开发者_JS百科ave to extend the functionality of his existing app but he does not wish to share his code with me.. so he says I should make a container app... I know it something similar to making in app purchases but can any one elaborate ?

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Note: you should definitely clarify this with your client instead of this community.

I guess your client wants to have an App-in-App structure that you find in various iOS applications in the AppStore. E.g. the three20 framework offers a launcher that is similar to the Springboard of the iPhone/iPad/iPod where you can put multiple apps (which aren't necessarily independent apps).