Does Windows support wireless screen projecting?

I am an IT lead in an All Mac office. However our parent company uses PC's and we share the same building with.

Currently in every conference room we have Apple TV's connected to either Projectors or HDTV's and this allows us to wirelessly mirror our displays for meetings and quickly switch between presenters with no cable management.

However my parent has asked me if their way a way for them to do the same thing one of the HDTV's in the conference rooms.

They use HP Elitebooks (fairly modern ones ) but they lack HDMi ports so I don't believe we can use a solution like Mircast or wireless HDMI.

We know we will have to buy some sort of adapter for the TV to have a chance of this working but is there any wireless screen beaming solutions for Windows 7 for business machines that lack HDMI?