[expert] How should I disable the login massage?

[=?x-unknown?q?Pe=F1a_Arellano_Fabian_Erasmo?=]

        Hi,

        Every time I log into my computer via ssh I receive the following
message:

                Last login: Thu Mar  1 16:13:09 2001 from host.domain.th

        How should I disable it? I know that for security reasons that
message should appear, but since I am running a message passing interface 
implementation, it appears every time a proccess logs into the machine and
it is printed also in the file I direct the output to. Thanks in advance.

        Fabian.