Int 66  - Reserved For User Interrupt
 Int 66  - Adaptec Controllers - Drive 1 Data
 Int 66  - Data General Dg10 - Microeclipse Coprocessor Interface
 Int 66  C - Nanosoft, Inc. Turbonet - Network Processing ???
 Int 66  - Pdisk By Scott Garfinkle - Overwritten For Hard Drive Information
 Int 66  - Microsoft Windows Vitd.386 Virtual Interval Timer
 Int 66  - Newkey V5.4 - Installation Vector
 Int 66 Fn 01  - Bitfax Scheduler - Set Mode???
 Int 66 Fn 02  - Bitfax Scheduler - Set Mode???
 Int 66 Fn 03  - Bitfax Scheduler - Schedule Fax Transmissions
 Int 66 Fn 04  - Bitfax Scheduler - Get Status???
 Int 66 Fn 05  - Bitfax Scheduler - Convert File And Send Fax
 Int 66 Fn 06  - Bitfax Scheduler - Set Mode???
 Int 66 Fn 0688  - IBMsnd Driver - Play 8-bit Digitized Sound
 Int 66 Fn 0689  - IBMsnd Driver - Report Sound Driver Status
 Int 66 Fn 068A  - IBMsnd Driver - Preformat Sound
 Int 66 Fn 068B  - IBMsnd Driver - Play Preformatted Sound
 Int 66 Fn 068C  - IBMsnd Driver - Report Audio Driver Capabilities
 Int 66 Fn 068D  - IBMsnd Driver - Report Current Sample Address
 Int 66 Fn 068E  - IBMsnd Driver - Set Callback Address
 Int 66 Fn 068F  - IBMsnd Driver - Stop Current Sound
 Int 66 Fn 0690  - IBMsnd Driver - "setaudiohardware" Set Up Hardware Info [o
 Int 66 Fn 0691  - IBMsnd Driver - Report Callback Address
 Int 66 Fn 0701  - IBM Digitized Sound Package Midi Driver - Get Digitized So
 Int 66 Fn 10  - Pendos - Tdmouse.exe - Get ???
 Int 66 Fn 11  - Pendos - Tdmouse.exe - Set ??? Handler
 Int 66 Fn 12  - Pendos - Tdmouse.exe - Initialize
 Int 66 Fn 13  - Pendos - Tdmouse.exe - Shutdown???
 Int 66 Fn 14  - Pendos - Tdmouse.exe - ???
 Int 66 Fn 15  - Pendos - Tdmouse.exe - Set ??? Handler
 Int 66 Fn 16  - Pendos - Tdmouse.exe - Unused Functions
 Int 66 Fn 21  - Pendos - Pink - ???
 Int 66 Fn 22  - Pendos - Pink - ???
 Int 66 Fn 23  - Pendos - Pink - ???
 Int 66 Fn 24  - Pendos - Pink - ???
 Int 66 Fn 25  - Pendos - Pink - ???
 Int 66 Fn 27  - Pendos - Pink - ???
 Int 66 Fn 28  - Pendos - Pink - ???
 Int 66 Fn 29  - Pendos - Pink - ???
 Int 66 Fn 2A  - Pendos - Pink - ???
 Int 66 Fn 2B  - Pendos - Pink - ???
 Int 66 Fn 2F  - Pendos - Pink - Initialize
 Int 66 Fn 3345  - Bitfax Scheduler - Remove Tsr From Memory
 Int 66 Fn 40  - Pendos - Pkeyus - Get Version
 Int 66 Fn 41  - Pendos - Pkeyus - Set ???
 Int 66 Fn 42  - Pendos - Pkeyus - ???
 Int 66 Fn 43  - Pendos - Pkeyus - ???
 Int 66 Fn 44  - Pendos - Pkeyus - Unused Functions
 Int 66 Fn 50  - Pendos - Pmouse - Set ???
 Int 66 Fn 51  - Pendos - Pmouse - Nop
 Int 66 Fn 52  - Pendos - Pmouse - ???
 Int 66 Fn 53  - Pendos - Pmouse - Unused Functions
 Int 66  - Pendos - Pmouse - Alternate API
 Int 66 Fn C5  - Pendos - Vload - API
 Int 66 Fn FFFB  - Microhelp Stay-res Plus - ???
 Int 66 Fn FFFE  - Microhelp Stay-res/stay-res Plus - Uninstall
 Int 66 Fn FFFF  - Microhelp Stay-res Plus - Find Program Name