Changing the Name of the Activity Fields

Hi experts

I really need your help for changing the name of the Activity fields in the Interaction Center WinClient.

What i need is to change in the Activity the following: For example:

1) In the label Priority i would like to put Secure Level

2) Ext.No. label i would like to put Person

The reason is because in the fields related to the standard label, i am putting information that is not related to the name of the label.

Is it possible to change the name of the label?

I would really appreciate your help on this

Thanks