You can have a look in the Joystick section of the forum, maybe TM Warthog, and have a look for settings, or RTFM <lg>.
TMS -> the TM (and AFAIK) stands for Target Managment
DMS -> the DM (and AFAIK) stands for Display Managment
DMS Up: HUD as SOI
DMS Down: FCR, HSD, … as SOI
DMS Left: Cycle through left MFD formats
DMS Right: Cycle through right MFD formats
CMS -> the CM (and AFAIK) stands for Countermeasures Managment
CMS UP: Drop Programmed
CMS Right: StandBy
CMS Down: ECM On - Consent
CMS Left: Def Jammer Program
Or you have a look at this:
It is from the FalconPedia, IIRC…
HTH</lg>