INT 2F - DESQview v2.26+ XDI - CUSTOM SUBFUNCTION, DVSIXDI.COM
        AX = DE01h
        BX = 7575h
        CX = function
            0000h installation check
                Return: AX = 00FFh if installed
            0001h turn on notification (currently unused)
                Return: AX = 0001h
            0002h turn off notification (currently unused)
                Return: AX = 0001h
            0003h get process information
                Return: AX = status
                            0000h failed
                            0001h successful
                                BX = last instantaneous time slice
                                        in 1/100s (v1.10)
                                        in 1/18s (v1.11+)
                                CX = number of processes
                                DX = number of "(starting)" records (v2.00+)
                                SI = number of records in process info array
                                     (v2.00+) (always 15 for v1.x)
                                ES:DI -> process info array (see below)
            0004h get version
                Return: AH = major version
                        AL = minor version
            0005h (v1.10+) get time since DESQview started
                Return: DX:AX = 1/100s since DV start (v1.10)
                        DX:AX = 1/18s since DV start (v1.11+)
            0006h (v1.10+) get number of task switches
                Return: DX:AX = total task switches
                        CX = task switches in last instantaneous interval
Notes:  DVSIXDI is part of the DVSI (DESQview System Information) package by
          Daniel J. Bodoh
        for v1.00, function 0003h allocates common memory, which the caller
          must deallocate after reading the process information; only the
          currently used records are placed in the buffer
        for v1.10+, function 0003h merely returns a pointer to the internal
          array of process information; the caller should make a copy of the
          array while inside a critical section (see INT 15/AX=101Bh).  Only
          those records with bit 7 of the first byte set are valid.
Index:  installation check;DVSIXDI

Format of information for one process (v1.00):
Offset  Size    Description
 00h    BYTE    flags
                bit 7: process slot is valid
 01h    WORD    offset into DESQVIEW.DVO of program's record if started from
                Open Windows menu, else undefined
 03h    WORD    Switch Windows window number
 05h    WORD    segment of process handle
 07h    WORD    number of tasks owned by process
 09h    WORD    mapping context of process (see INT 15/AX=1016h)
 0Bh    DWORD   hook for other programs

Format of information for one process (v1.10-v2.00):
Offset  Size    Description
 00h    BYTE    flags
                bit 7: valid record
                bit 6: (v2.00+) record is allocated; if bit 7 clear, process
                        is "(starting)" and only offsets 01h and 09h are valid
                bit 5: (v2.00+) this app currently owns the CPU
                bit 4: reserved (0)
                bit 3: DESQview system task
                bit 2: reserved (0)
                bit 1: task has keyboard (currently unused)
                bit 0: task swapped out (currently unused)
 01h    WORD    Open Window keys
 03h    WORD    Switch Windows number
 05h    WORD    segment of process handle
 07h    WORD    number of tasks for process
 09h    WORD    process mapping context
 0Bh    DWORD   time process started (relative to start of DESQview)
 0Fh    DWORD   time process last got CPU (relative to start of DESQview)
 13h    DWORD   time process last gave up CPU (relative to start of DESQview)
 17h    DWORD   total CPU time since process started
 1Bh    DWORD   CPU time at start of current instantaneous interval
 1Fh    DWORD   CPU time in current instantaneous interval
 23h    DWORD   hook for other programs
Note:   all times are in 1/100s for v1.10, in 1/18s for v1.11+

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