Change which apps the dash displays for a keyword

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http://askubuntu.com – OK I've just switched back to ubuntu after a bit of distro hopping, my last install was 11.10 this install is 12.10. I am using the web app for gmail which is working fine except for when I hit the dash and type mail all I get is Thunder Bird. If I type gmail then the web app shows but not on the word mail. My Question is is there a way to manually add the gmail web app to appear when I type mail in the dash. (HowTos)