While grml kernel has been upgraded to v2.6.26, v2.6.28 etc. The latest
open-vm-modules-grml is still at v2.6.23. 

The open-vm-modules is necessary for the open-vm-tools to work, because The
open-vm tool kit is composed of kernel modules for Linux (open-vm-modules) and
user-space programs (open-vm-tools & open-vm-toolbox).

The Open Virtual Machine Tools (open-vm-tools) are the open source
implementation of VMware Tools.The tool kit provides several useful functions like:

    * File transfer between a host and guest (vmware-hgfsmounter)
    * Improved memory management and network performance under virtualization
    * General mechanisms and protocols for communication between host and guests
and from guest to guest (e.g, copy/paste x-selections between VMware host and
client via clipboard)