How to create external jar files to use in Taleo Connect client (TCC)

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Hi all,
We need to develop a custom step, but we did not find documentation about what characteristics those jar files should have to work with Taleo Connect Client.

I do not need assistance to use TCCCustomsSteps (http://ohug.org/p/do/sd/sid=2051&type=0), I need to create my own custom step similar to that.

Do you have any documentation about it to share me?

Thanks