Activate procedure for two clients!

[janevblagoj]

Dear Sir,

I work in Delphi 6 a few years.
Now I was beginning in Delphi network and I need some help maybe in source code
Or advice for following:
I have chat application and have two peer to peer clients, and I want to start one procedure
(For example Form2.ShowModal) on first client, and I want on a second client automatically to start same procedure(Form2.ShowModal) . How to it I may achievement.
Please help me?!!

Thank You
Blagoj