The 4 default listening ports for XCOM for Windows are:
How can those port numbers be changed?
XCOM Data Transport for Windows
On Windows the XCOM Listener ports can only be set in the GUI on the Global Parameters tab. After they are entered, they are not written into the xcom.glb file, but are written directly into the registry at location: HKEY_LOCAL_MACHINE\SOFTWARE\ComputerAssociates\XCOM\CommunicationServer.
Getting Started with GUI > Update Global Parameters
See "TCP/IP Parameters" and sections "Server Settings" and "Secure Socket Server Settings"