INT 1A - Disk Spool II v1.83 - FUNCTION CALLS
        AH = ADh
        AL = function code
            02h enable spooler only
            03h enable the despooler
            04h disable the despooler
            08h inhibit popup menu
            09h enable popup menu
            0Ah ???
            0Bh disable the spooler
            0Ch start despooler after last successfully printed document???
            0Dh start despooler at the exact point where it last left off???
            0Eh pop up the menu
            0Fh ???
            11h ???
            14h ???
            15h ???
            16h ???
            17h ???
            18h ???
            19h ???
            20h clear file pointed to by the despooler???
            21h ???
            22h ???
            23h ???
            30h ???
Return: AH = 00h if successful