Doubt on User Exits!!!

Hi,

Suppose if i create a project using CMOD transaction. how can i use that project and where i can use the same.

For ex: i will create a project with the name "ZTEST1" and select one enhancement name, further will implement some code in the respective area. Now i will activate each and every thing.

where and how can i use the project "ZTEST1" in our programs?

Kindly advice...

Thanks in advance.

Ramesh.