Problem with two application con window installer

[eddy2k]

Hallo

How to install two application with windows installer from the file main.cmd.

If two installations start, one tell me that the installer is busy with another application and it doesn't install the successive application.

Can someone tell me what is the command to wait the ending of the first application and then go on...

The command start /wait and the switches /qb don't function in this situation.

Thank you