TIdSocketList - List of duplicated socket handles.

Clone is an abstract virtual TIdSocketList function that specifies the interface used to create a duplicate copy of the socket descriptors stored in the list. 

Clone must be implemented in a descendant class using a protocol stack implementation for a specific operating system or platform. 

Use Lock to protect resources in the current socket list prior to cloning socket descriptors. Use Unlock to free the resource protection used during the operation.