one way glass - yes, had considered that - and as bay window is actually 5 columns by 3 rows of glass even wondered about making a "big brother" CCTV look by having a webcam for each window on the top row LOL
Snorbs - thanks for the comments. Have used VNC but don't generally touch Remote Desktop. Tend to use LogMeIn to access client/ family PCs if necessary.
Here, I have a mix. Currently one or two Win 98SE, several XP, an iMac (planning to increase to several) and a few linux machines (planning to use at least three different distributions - it helps when supporting different clients with VPS hosting).
Yes, the video cable thing could be a problem but one of the KVM switches I just bought has USB and VGA inputs for each machine, and I'd be aiming to put some very quiet machines behind a partition on shelving so the cables would be only thing coming to my side of partition.
Have also considered using Y splitters so I can plug into both local monitors and have cables off to KVM, allowing me to see other outputs, but concentrate on screen closest to me with keyboard + mouse.
Still have not decided whether to use shelving and laptops (like library magazine rack), as long as I can find laptops which open out to 180 degrees - several newer machine will only open to about 120 degrees which make them unsuitable.