https://stackoverflow.com/questions/13540154
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In short:
A UID is a globally unique identifier consisting of a 32-bit number. UIDs are used throughout the Symbian platform to enable various kinds of file identification and association.
Because UIDs are fundamental to the Symbian platform, it is important that they are used correctly when developing programs. To ensure uniqueness, it is essential that UIDs are properly allocated. Uniqueness is guaranteed by allocating UIDs centrally from a database managed by Symbian at https://www.symbiansigned.com.
And:
During development, or for test code, temporary UIDs may be chosen from the unprotected test range 0xExxxxxxx. These UIDs can be used during development for unsigned applications but must not be used in released software. Note that such applications may not be installable via a SIS file. See the Symbian Signed website for more information.
Care must still be taken to avoid clashes within development teams and between multiple projects, including old projects which may still be installed on an emulator or native platforms. UID clashes may stop a program from loading correctly, typically leading to Not Found errors.
For a comprehensive description about UIDs see the relevant page in Symbian Developer's Library.
