Once the program is launched, the main program window is opened (fig.1). It is the configuration window. This image below shows the Virtual Null Modem screen with its various parts labeled.
Fig.1 The main program window
The menus of Virtual Null Modem are located on the menu bar. The sub-menus of the main menu are Devices, System, View and Help. Each item in these menus is described in this section below. Some menu functions are also activated by pressing combinations of keys on the keyboard (called "Hotkeys" in this Help file)
Another way to access some edit menu functions is to click the right button of the mouse. See the help paragraphs on each function for more information. Hotkeys are described thus: "Ctrl+N" means that the user holds the Ctrl key down while simultaneously pressing the N key. The appropriate keyboard shortcuts and toolbar buttons are shown with each menu item.
After adding serial port pairs you should click the "OK" button to apply all changes. If it's first time, when you had added serial port pairs, then Virtual Null Modems software will install drivers and it can take few minutes on slow computers, please, wait while Virtual Null Modems software adding new virtual devices. This process will be accompanied by messages in the system tray like as fig.2 and fig.3. This messages will apper for each virtual serial port in the list. Next time Virtual Null Modems software will not display this messages and will use drivers installed before.
Fig.2. Virtual Null Modems software adds a virtual serial port
Fig.3. Virtual Null Modems software installs drivers
After installing drivers new virtual devices will appear in the device manager (see fig.4).
Fig.4. Virtual Null Modems devices in the devices manager
Now you can use these serial ports (a serial port number showed in brackets) in your software as a common hardware serial port.