How to develope 2 Google App Engine projects on the same PC?

A year ago I used my own personal gmail account to develop my 1st Google App Engine program, I'm still developing and using it, I have 2 apps under this private account.

Now I have registered another App Engine app with another gmail account for an organization and their project, but when I tried to deploy this second project for the first time, I've noticed the following:

20% Scanning files on local disk.
25% Initiating update.
Password for ABC***@gmail.com: 
Error Details: .....

"ABC***@gmail.com" is my private gmail account which was/is used for the 1st project, I didn't want to include the 2nd project in the 10 apps o开发者_StackOverflow中文版f my 1st project, that's why I registered the 2nd project with the 2nd gmail address, so my question is : how to tell the 2nd project to use the 2nd gmail address for that project ? Where is the gmail address associated with the project in the config files ?

PS : I'm running Win 7, and using NetBeans 7.0 with App Engine 1.5

In this case you may want to try AppCfg, a command line tool provided with GAE SDK. You can find it in $GAE_FOLDER$/bin. The command for uploading your project is appcfg -e YOUREMAIL -passin YOURPASS update YOURAPP_DIR.