Int 2F  - Bmb Compuscience Canada Utilities Interface - Installation Chec  [t]

   AH = xx (dynamically assigned based upon a search for a multiplex
        number which doesn't answer installed)
   AL = 00h installation check
   ES:DI = EBEBh:BEBEh

Return: AL = 00h not installed
        01h not installed, not OK to install
        FFh installed; if ES:DI was EBEBh:BEBEh on entry, ES:DI will point
        to a string of the form 'MMMMPPPPPPPPvNNNN' where MMMM is a
        short form of the manufacturer's name, PPPPPPPP is a product
        name and NNNN is the product's version number