Shell Programming and Scripting

Hi,

Could you please advice on the following query:

There are 2 users on a unix box:
1. aaaa
2. bbbb

I open 2 putty sessions and login with the above 2 users.
Then I type the following using the aaaa user to chat with bbbb.

talk bbbb
or
talk bbbb@hostname

Result: the screen goes blank?

Any ideas, please?

Regards,
Girish.

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