dmi, interface de gestion de l'ordinateur de bureau; procédé unique qui permet la gestion des différents programmes ainsi que la diversité des matières dans l'ordinateur personnel
dt = transmission de données

One possibility that seems quite common, but it would depend on the type of company.

S'il s'agit de direction et qu'il ne s'agit pas d'informatique, alors je suggère "Division of Management Information" = "Division de l'information de gestion". Pour ce qui est de DT, je dirais "Decision Tree" = "arbre décisionnel" (corporate DT = marbre décisionnel de l'entreprise), mais avant tout, je demanderais au client.

Si vous croyez qu'il s'agit d'autre chose, alors :

Voici la liste des définitions possibles de l'abréviation DMI:
Desktop Management Interface
Directional Movement Index (financial charting analysis)
Dry Matter Intake (milk production)
Danmarks Meteorologiske Institut (Danish Meteorological Institute)
Design Management Institute
Disaster Mitigation Institute (India)
Dairy Management Inc.
Directional Movement Indicator
Digital Musical Instruments
Division of Management Information
Developing Mathematical Ideas
Don't Mention It
Digital Media Institute
Digital Marketing International
Dimensional Metals Inc.
Danish Maritime Institute
Data Mining Institute
Department of Medical Informatics
Digital Multiplexed Interface
Distance Measuring Instrument
Distributed Management Interface
Digital Musicworks International, Inc.
Definition of Management Information (X.721/ISO 10165.2)
Direct Measurements, Inc.
Driving Me Insane
Diagnostic Medical Imaging
Driver Machine Interface (rail)
Design and Manufacturing Institute
Dansk Militært Idrætsforbund
Direct Machine Interface (digital printing industry)
Daughters of Mary Immaculate
Department of Military Instruction (United States Military Academy)
Dana Mediation Institute, Inc.
Disaster Management Institute (India)
Deaf Ministries International
Depot Maintenance Interservice
Direct Memory Interface
Direct Matrix Inversion
Data Mode Idle
Displacement Measuring Interferometer
Decanter Machine Inc.
Desert Medical Imaging
Desmethylclomipramine
Deaf Match International
Digital Motorworks Inc.
Disease Management Initiative
Diesel Marine International Limited
director military intelligence (US DoD)
Distribution Management Inc.
Document Management Institute (Clarity, Inc.)
Dry Microburst Index
Deployment Mapping Instrument
Data Management and Intelligence
Dove Mission International
Distributed Method Invocation
Documentation Management Infrastructure
Disk Memory Interface
Descriptive Method Identification
Defense Maintenance Inter-service
Data Mart Interface
Dot Matrix Indicator

Et voici les définitions possibles de l'abréviation DT:
Date
Data
Desktop
Deutsch
Downtown
Detention (school)
Date-Time
Downtime
Data Type
Data Transmission
Distrito Federal (Federal District of Brazil)
Duct Tape
Detroit Tigers
Digital Television (used in TV callsign)
Detoxification
Direct TV
Deutsche Telekom
Dream Theater (band)
Driver Training
Delay Time
Dial Tone
Design Technology
Display Technology
Decision Tree
Dark Tower (book series)
Defensive Tackle (football)
Data Terminal
Dragon Tales (TV show)
Double Time (on overtime forms)
Director Técnico (soccer coach)
Double Team (gaming)
Dead Time
Doing Time
Death Trap (gaming)
Dark Tranquillity (band)
Decay Time
Day Tripper (Beatles song)
Delirium Tremens
Dwell Time
Decision Technology (choices)
Decision Technology
Diphtheria-Tetanus (vaccination)
Disruptive Technologies
Dark Throne (band)
Ducktales (cartoon)
Double Top (trading Markets; stocks, bonds, commodities)
Discus Throw
Data Track
Doubting Thomas
Detection Threshold
Display Terminal
Dew Point Temperature
Double-Throw (switch)
Dunk Tank
Dark Tournament (Yu Yu Hakusho, gaming)
Domain Theory
Decreasing Term (insurance)
Darktide (gaming, Asheron's Call)
Deep Trench (bipolar junction transistors)
Displacement Transducer
Demonstration Test
Development Type
Detention Time
Double Transfer (philately)
David Tao (Chinese singer)
Dietetic Technician
Developmental Training
Deuterium-Tritium
Dark Templar (Starcraft gaming organization)
Dragontown (music album)
Delivery Ticket
Differential Transformer
Distance Transform
Dynamic Tracking
Dragon Tails (webcomic)
Death Touch (gaming clan)
Drunken Tiger (band)
Directional Transmission
Distribution Terminal
Deduction Theorem
Double Torsion
Double Tagging (LAN Switching)
Difference Threshold
Drive Tire
Design Tolerance
Drive Tube
Design Trainee
Dharga Town (Sri Lanka)
Deseret Towers (BYU student housing)
Draco Trilogy (fanfiction)
Drag Turn (marching band)
Doctor Theologiae (Latin: Doctor of Divinity, Codices and Manuscripts)
TAAG - Linhas Aereas de Angola (IATA airline code)
Development Test/ing
Deployment Transaction
Dynamic Tear/Test
Day/Daytime Television
Disability Taskforce (Australian Computer Society)
Deletion Threshold
Dick Togs
Dedham Times (Dedham, Massachusetts)
Degrees Twaddle (measurement of brine density)
Dedit Testamento (Latin: He/She Left Through Will, epigraphy)
Development/al Test/ing
Decision-Related Tracker
Directorate for MASINT and Technical Collection (DIA) (US DoD)
(USN Rating) Dental Technician

Bonne chance.

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Note added at (2006-01-19 17:18:30 GMT)
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oops! Arbre décisionnel, pas Marbre...