If you don't see a mouse cursor on NetDCU you have to change the value EnableCursor in registry.
To do start ndcucfg and type
After restart mouse cursor should be visible.
The above example is for NetDCU6. For other NetDCU's replace au1100 with SAMSUNG (NetDCU8) or SMIVGX (NetDCU5.2).
Mode100 is the key of your current selected mode. Type
to return your current mode.