Int 2F Fn 4A05  U - DOS 5+ Dosshell - Task Switching API???                [T]

   AX = 4A05h
   SI = function
       0000h reset???
       0001h ???
       ES:BP -> 80-byte buffer containing ???
       0002h ???
       0003h ???
       0004h ???
       BL = ???
       0005h ???
       0006h get ???

       Return: ES:SI -> ???
       0007h get ???

       Return: AX = ???
       0008h get ???

       Return: DX:AX -> ??? (internal control data of some kind)
       0009h get ???

       Return: ES:SI -> ??? (apparently identical to function 0006h)
       000Ah ???
       BL = length of buffer
       ES:BP -> buffer containing ???
       000Bh get ???

       Return: AX = ???
       000Ch ???
       BL = ???

       Return: if BL nonzero on entry
               DX:AX -> ???
           if BL = 00h on entry
               ES:SI -> ???

Notes: DOSSHELL chains to the previous handler if SI is not one of the values
     listed above
   the DOSSWAP.EXE module calls functions 03h,04h,05h,07h,08h,09h,0Ch
   the Windows 3.1 DSWAP.EXE and WSWAP.EXE task switchers use these calls

See Also: AX=4B01h