7.1.7 DTM Registration

• Installed
• Uninstalled
• Modified, (e.g. new device types are supported or the DTM was updated (bug fix))

A FDT root path is defined for FDT in windows registry:
[HKEY_LOCAL_MACHINE\SOFTWARE\FDT\DTMCatalogUpdates] *)
*) HKEY_LOCAL_MACHINE allows DTMs to write a registry key and string. During DTM setup user has to have Administrator rights anyway, so there is no missing right. While Frame session, a user can have normal rights. A Frame must only read the registry key so the missing right is not a problem. Instead of setting this attribute to optional , its mandatory and allowed to set an empty string. This avoids having old comment together with new flag.

Frame Applications may update an DTM Library and save the last known ModificationFlag entry internally. A Frame can easily check if there is a need to update the DTM Catalog by comparing last known entry with current entry.

Comment:
It was seen as acceptable to leave the entry in registry without a concept for a cleanup because there may be a number of Frame Applications installed on one PC. Frame Applications are only allowed to read these keys. DTMs must update ModificationFlag and ModificationComment during setup.