Note: Your application have to have unique java package path and name, if there is same name already in device you cannot install it.
Separate dialog, default should be ok
Android application framework requires packages to be signed by authors key, so make a key store file, for example to Desktop. Select some easy remember 6 character password (or go secure if you like, not much matter at this point).
From eclipse or with adb tool in Android SDK/tools/ .
Open Window Start ⇒ Accessories ⇒ Command Prompt
> cd "\Program Files\android-sdk-windows\tools" > adb install "Document and Settings\hevi\Desktop\Wictionary.apk"
(there was name conflict in Wictionary, as it was installed to device by default, so renamed and refactored package path)