How to support Amazon and Android Market links in same APK

Possible Duplicate:

Supporting Amazon and Android market links inside application

I was wondering if and how you could differentiate between an Amazon App Store installed app and one installed from the Market.

Emulator for Amazon Kindle

My app would work very nicely on the new Amazon Kindle Fire, but it would be nice to test it and remove any kinks before they flood onto the market! Is there an emulator of the kindle fire available

Posting Data to Amazon using curl

when we enter a keyword (search term) in amazon kindle book store, search brings a list of books back.

Amazon EC2 Linux RH cannt connect from php script to RDS MYSQL

I have an amazon EC2 instance (redhat linux ) and a RDS (mysql 5.5 ). After stop /start EC2 instance. EC2's ip was changed and cannt connect RDS anymore. I can successfully connect RDS instance from command line. However, it is unable to connect from php script and give me this warning. PHP Warning: mysqli::mysqli(): (HY000/2003): Can't connect to MySQL server on 'applicantdb.xr3x2xcale.eu-west-1.rds' (13)