Installing IUS

I'm a novice guy installing IUS, and went through each and every page over the manual. First, i created the group and user informix, then I created the directory for informix and set the appropriate environment variables of informixdir... then I looked at the key card and checked the command tar xvf /dev/ (devicename) and I've never known which is the devicename for the cdrom drive. hell, I've tried them all ! check it out: ict2% cd /dev ict2% lsarp ksyms ptypc ptyr7 sd0e ttyp4 ttyqf audio le ptypd ptyr8 sd0f ttyp5 ttyr0 audioctl llc1 ptype ptyr9 sd0g ttyp6 ttyr1 bd.off log ptypf ptyra sd0h ttyp7 ttyr2 be logindmux ptyq0 ptyrb sound ttyp8 ttyr3 bpp0 md ptyq1 ptyrc sp ttyp9 ttyr4 cgsix0 mem ptyq2 ptyrd sr0 ttypa ttyr5 conslog mouse ptyq3 ptyre stderr ttypb ttyr6 console null ptyq4 ptyrf stdin ttypc ttyr7 cua openprom ptyq5 qe stdout ttypd ttyr8 dsk printers ptyq6 rawip swap ttype ttyr9 dump profile ptyq7 rdsk syscon ttypf ttyra fb ptmajor ptyq8 rmt systty ttyq0 ttyrb fb0 ptmx ptyq9 rsd0a tcp ttyq1 ttyrc fbs pts ptyqa rsd0b term ttyq2 ttyrd fd ptyp0 ptyqb rsd0c ticlts ttyq3 ttyre hme ptyp1 ptyqc rsd0d ticots ttyq4 ttyrf icmp ptyp2 ptyqd rsd0e ticotsord ttyq5 udp ie ptyp3 ptyqe rsd0f tnfctl ttyq6 volctl ip ptyp4 ptyqf rsd0g tnfmap ttyq7 winlock ipd ptyp5 ptyr0 rsd0h tty ttyq8 wscons ipdcm ptyp6 ptyr1 rsr0 ttya ttyq9 zero ipdptp ptyp7 ptyr2 sad ttyb ttyqa zsh isdn ptyp8 ptyr3 sd0a ttyp0 ttyqb zsh0 kbd ptyp9 ptyr4 sd0b ttyp1 ttyqc zsh1 kmem ptypa ptyr5 sd0c ttyp2 ttyqd kstat ptypb ptyr6 sd0d ttyp3 ttyqe then I had a huntch and tried on /dev/dsk/ tar xvf /dev/dsk/c0t6d0s0 tar: /dev/dsk/c0t6d0s0: Device busy Any hint? any thing I should know? Please help! /* This is the main procedure, it prints email information */ void main() { printf("Hello World!, this is an email!\\n"); printf("Roberto Dircio Palacios Macedo\\n"); printf("is092756@cca.pue.udlap.mx\\n"); }