Hi
You can do this by creating a simple Python label expression. All you need to do is:
1: Labelling tab > Label button to label the features.
2: For Field choose the Expression button.
3: In the Label Class dialog change the Language to Python
4:Write the following Expression:
"OID: " + [OID] + "\nXCOORD: " + [XCoord] +"\nYCOORD: " + [YCoord]
5: Press the Check button to check the syntax and then the Apply button.
Hopefully that is it.
Many thanks ed