There are three diskettes shipped with the IBM ISDN International PC Card Modem with GSM Capability. Diskettes one and two stores the files needed for modem installation. Diskette two also has the utility for the country selector and diagnostics. Diskette three has the file needed for the ISDN package. To use them, download the file to your c: drive and type the file name at the command prompt. (ie C:\isdgsm16) These files are self-extracting and will require a formatted diskette for each file. For detailed install instructions, refer to your User Guide which came with the modem. File ISDGSM16.exe = Diskette 1 Use for Installation File ISDGSM23.exe = Diskette 2 Use for installation and utilities File ISDGSM33.exe = Diskette 3 Use for ISDN Package