Traditionally, Contractors, Sub-contractors and Suppliers go down to physical plan rooms to search for bid opportunities. In addition, they sometimes have difficulty coordinating addenda and revisions on construction plans. When field modifications happen, early disposition and an easy way to reduce the delay becomes a life saver. Having an easy way to communicate those issues and a simple and secure way to get those revised plans is essential to profitability. idtplans.com was designed with this idea in mind. idtplans.com is the first of it's kind, offering on-line access in all phases of the construction process: from the conceptual design, to the municipal review, to the "as built" stage. All phases can be viewed, shared, and are available on-line. Change a plan cooperatively and instantly with a simultaneous red-line tool. The Red-lining tool is similar to instant messaging, but better, since it retains all suggestions and changes which are viewable in the future, unless removed by the author.