Why is the msgbox so stupid.

I have created a messenger. Now sometimes a user has to be noticed about something (and maybe click on a button). I used the msgbox, but I found out that the whole code wait until a button is pressed, so If a user doesn't react soon enoug some data will be used later. I use a function to see if a user is still online to confirm to a question each time. I give it 10 seconds of time. When the users has a msgbox open for this 10 seconds the program can't react on time so the program thinks it is offline. How to fix this??

I have made my own msgbox form, but the problem is that some subs must wait until a button is pressed. I used an array of forms. But if a program (sub) has to wait until a button is pressed I can' t call the sub again. Anyone has got any idea how to fix this. I also tried to use activex etc, but nothing.

Every idea could be helpfull