Hello Ana,
Are you referring to specific CA products, such as CA Unified Infrastructure Management (UIM) and CA IT Service Manager (ITSM - Formerly Service Desk Manager)?
If so, please provide the product and version names as that will help.
Note that the home of UIM is here:
Data in and out of CA ITSM is typically handled by Web Services calls or emails. So if your application that you wish to integrate ITSM with can handle either of those, then you're off to a good start.
Thanks, Kyle_R.