Every kernel version needs binary compatible modules. Modules are stored under Linux in directory /lib/modules, a different directory for every kernel version, for exsample the current is /lib/modules/2.6.11-co-0.6.4 All preconfigured coLinux distributions have no modules installed. This let the distribution untouched for newer coLinux versions in future. CoLinux can run without modules. Mostly wanted devices are included in kernel directly.