Int 16 Fn FA02  U - PC Tools V8+ Vsafe, Vwatch - Get/set Options           [v]

   AX = FA02h
   DX = 5945h
   BL = new parameter flags (see below)

Return: CF clear
   DI = 4559h
   CL = old value of parameter flags

Bitfields for parameter flags:
 bit 7 Protect executable files
 bit 6 Protect FD boot sector
 bit 5 Protect HD boot sector
 bit 4 Boot sector viruses
 bit 3 Check executable files
 bit 2 General write protect
 bit 1 Resident
 bit 0 HD Low level format