Create new application part in my cms

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hi everybody
i want to know can i create my application and put them into concrete5?
for example:
i want to create a registration system and put them into concrete5
i would like to know how can i do it?
its possible or impossible?

 
Remo replied on at Permalink Reply
Remo
there are several wonderful APIs you can use to hook your application into Concrete5.

You can either create a "block" or a complete "package" which contains several blocks, file etc.

There are a lot of examples around where you can have a look. PHP Skills needed of course.
davidjames replied on at Permalink Reply
thank you for your help,
i`m new in php,can you help me more to find more resources about creating package or blocks and how can i create my own packages.
i need any links.
anyway thank you so much