In order to improve code reliability, and as a service to programmers, DicomObjects includes constants for some of the commonly used DICOM well-known UIDs, which are listed here, by category. Note that the import procedures for some languages (including Microsoft Visual C++) do not include string constants. If you wish to use these constants in such environments, then you are advised to copy this list from the help file into a header file, and edit to suit the requirements of your language.