Translating from Delphi to VB6

[dilettante]

I'm translating an app from Delphi to VB6.
Form1 sends a message to Form2 using SendMessage and WM_APP.
Form2 receives the message and does something.
It's very easy to do it in Delphi, but I have no idea how to do it in VB6.
Please, can you help me?

Sounds like a Poster Child for why you might as well rewrite from scratch.

How many times have you written a program where code for one Form has to "broadcast" something to every other Form anyway?

I'd hate to see what the meat of the application is written like.