How can I open multiple project file?

Yes, in AppCode 1.5 use File | Open Project, in AppCode 1.6 - File | Open. You'll be offered to open the project either in a new frame or replace the already open project.

Ummm...
Where is fault in my sequence..

Following is my sequence.
Please look at this.

1) I have used AppCode 1.6 EAP.



2) In case which open 'HealthCare' Project,



3) I clicked 'Open Project' feature.


4) And then I selected other project 'DrawLine'.



5) Clicked Window menu, I could see only DrawLine project.

You probably checked 'Do not ask again' in the dialog that offers to open the project. Please check 'Preferences | General | Confirm window to open project in' - it should be enabled.

I follow your advice, it well work. :D

Thanks Anton. Have a good day!