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yes usually twain devices have standard features but there might be certain settings which don’t have to be included in the twain standard. for example file transfer is not included (file transfer means you transfer an image from the source to your app and it is automatically saved to your hard disk, there are other transfer modes which only send a buffer full of data to your app and you have to make sure it is saved yourself). this could be a problem if you want to get a dicom picture from your CT scanner and not just a bmp for example.
there might be certain settings for a CT scanner like view angle you might need which are not included in the twain standard.
so just start twack and go to File->Select Source->CT Scanner
then you do
Special->Load/Open SM
Special->Open Source
Special->Send….
now you only have to change Capability to CAP_SUPPORTEDCAPS and Container to TWON_ARRAY and press send.
now you should have a list of all caps your device supports.