I downloaded DB2 runtime client (FP6_WR21340_RTCL.exe 67Mb) and downloaded db2ite80.pdf - Quick Beginnings for DB2 Clients.
There is pdf file "Chapter 6. Configuring client-to-server communications using the command line processor" I found that
3. Catalog the node by entering the following commands from a db2 prompt:
catalog tcpip node node_name remote hostname|ip_address\
[remote_instance instance_name] [system system_name] [ostype os_type]
I executed command line processor from "C:\Program Files\IBM\SQLLIB\BIN\DB2CW.BAT" and get error
SQL1390C The environment variable DB2INSTANCE is not defined or is invalid.
also follwing command is not work too
catalog tcpip node db2node remote 192.168.0.3 server 3700 terminate