These menu stub provides the means to deal with the process box connectors.
File: Attach a file to a process box connector. You can either select this on the Connector popup or hit the "F" key. A crosshair will appear and the user should then move it into the zone of a connector either just in front of the ingoing arrow or just behind the outgoing arrow. These are the connector "sensitive zones".
A left click will cause a standard file selector box to appear which is then filled in after which a tiny file box symbol will be attached to the arrow. Failure to click in the connector sensitive zone will cause an error message to appear announcing that no connector was selected - dismiss it and try again.
Ground: like any electrical circuit a net cannot have any unconnected or open data stream connectors (however stderr connectors can be left "hanging"). Unused connectors must be grounded. You can either select this on the Connector popup or hit the "G" key. A crosshair will appear and the user then left clicks in the connector sensitive zone. An electrical ground symbol will appear.
Unlink: unconnect a used connector. You can either select this on the Connector popup or hit the "U" key. A crosshair will appear and left clicking in the sensitive zone will cause the file to be detached or the connection to another process box to be broken.
Move: move a connector around the boundary of a process box. You can either select this on the Connector popup or hit Shift+M. A crosshair will appear. Move it into the sensitive area of the connector and hold the left mouse button down. By moving the mouse the connector can be moved. Releasing the mouse button "drops" the connector.
Not listed in the Connector popup is the means of attaching the connector of one process box to that of another. Simply move the mouse pointer into the sensitive zone of a connector and click the middle mouse button; then move the mouse pointer to the connector sensitive zone of the box you wish to connect. Another middle mouse click will cause a line to be drawn between the two connectors.
Any connector can be detached by holding the ctrl key down, moving the mouse pointer into the connector sensitive zone, and middle mouse clicking.
A file can be attached to any open connector by holding the shift key down, moving the mouse pointer into the connector sensitive zone, and middle mouse clicking.