implicit focus in linux?

[Fenglou Mao]

Dear all,
     Can you tell me how I can use implicit window focus in my
slackware3.4?

Sincerely Yours,

FengLou Mao
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ADD:Mr. FengLou Mao
    Peking University
    BeiJing
    P.R.China
Tel:86-10-62751490
Fax:86-10-62751725