Hi Mazahir,
I understood your question, what I do is keep a log in a table
with the user and/or computer ID, every time they start the application
I check a flag in the log table for that user and/or computer,
and then just perform a SQL statement against that table and send
the message to everybody in the list,
you can get the user name with :

DECLARE INTEGER GetUserName IN advapi32;
STRING @ lpBuffer,;
INTEGER @ nSize

lcMyName = SPACE(250)
lnMyByffer = 250

lnResult = GetUserName(@lcMyName,@lnMyBuffer)

?lcMyName




Good luck!

>hi luis
>thanks for ur reply.but i want to send messagve only thouse users
>which is currently loged inside my SYStem.
>
>reagrds
>Mazahir