Reposting the question:
i started the uml as follows:
./linux ubd0=/home/adilm/test1.diff,/home/adilm/uml/linux-2.4.26/root_fs.rh72.pristine con=port:9901 con0=fd:0,fd:1 umid=test1 mem=32m
Now I open 3 terminals on the host OS and telnet on the uml with the following command
telnet localhost 9901
Only 2 terminals are able to connect to UML and gives login prompt. My question is why it is restricted to only 2 telnet terminals??? Can i increase the no. of terminals connected to UML.
Also what does this parameter is used for :

Thanks and Best Regards,
Adil Mujeeb