No change of files of operational system occurs - anywhere in EULA there is no interdiction to use additional monitors, keyboards and mice for the organisation of additional workplaces. As to other programs yes, for Microsoft Office in such configuration it is necessary to buy additional licences about what it is told in its licence. Microsoft much that does as it it is pleasant, instead of how it is convenient to you It at all advertising, the person has asked and has received the answer. Forgive for my English, I use a translation program, I will not tell what, and that again will tell that I am engaged in advertising