This entry is used in combination with AllowReactivation to identify a machine.
Example
CheckInstCodeType1=2 (MAC-Address)
CheckInstCodeType2=3 (Hostname)
CheckInstCodeType3=1 (Volume ID)
To allow a reinstallation on a machine, the MAC Address and Hostname and Volume ID have to match.
Default value: no default value
See also
AllowReactivation - activate this option and detail information
MinIdenticalInstcodes - additional configuration setting
IgnoreLocalInstCodes - additional configuration setting