Loop in ActiveX control

Hello all

I have written an ActiveX control to read and write to the serial port using API calls waitcommevent ... & readfile ...
The problem I am having is I am using waitcommevent to raise an event and launch a sub routeen which then calls readfile in the client form / module the main problem is it pauses the code in the client application. How can I return control back to the client while waiting for a waitcommevent to arive?

Write multi-threaded code.

What language are you using? If you want to do this in VB6 - well, it's possible, but I wouldn't recommend it unless you are a seasoned expert.

Otherwise move onto .net which has multi-threading natively in the runtime so most languages support it.