Method for inserting objects into a working area in a computer application

An apparatus for creating a logical network by inserting a plurality of objects into a working area on a computer display, comprising:

• means for displaying an existing network in said working area;
• means for identifying at least one subarea of the working area where an object is validly insertable into said network;
• means for identifying at least one type of object that can be validly inserted into the network in said subarea;
• means for visually indicating said at least one subarea on the computer display;
• means for visually indicating said at least one object type in association with each indicated subarea on the computer display;
• means for receiving input from the user selecting one of said at least one object type indicated in association with one of said at least one subarea;
• and
• means for displaying an extended network where an additional object of the selected type is inserted into the selected subarea,
• wherein a computer application software is used to create the logical network.