VMware Tools Help : Components of VMware Tools : VMware Tools Service

VMware Tools Service
The VMware Tools service starts when the guest operating system boots. The service passes information between host and guest.
This program, which runs in the background, is called vmtoolsd.exe in Windows guests, vmware-tools-daemon in Mac guests, and vmtoolsd in Linux, FreeBSD, Solaris guests. The VMware Tools service performs the following tasks:
Note
In Mac guests, the VMware Tools service only fits the screen resolution of the guest to the screen resolution of the host.