iDelegate installs nothing on individual computers. It only needs a reasonably modern Internet browser and an Internet connection - whether wired, WiFi or mobile - which iDelegate forces through transport layer security for encrypted connection to the server. iDelegate has been engineered to do most of its processing on the server in order to reduce pressure on underpowered business PCs.
Long story short, it is hard to find a system nowadays that would not be able to access iDelegate speedily and securely.