To open the utility, click the Setup shortcut (see Description of com0com Shortcuts ) or launch the setupg.exe file from the com0com installation folder.
Parameters and tools in the right part of the utility window are supplied with tooltips (displayed on mouse over):
Utility tools are:
The port tree (displays pairs, ports and port parameters):
Editors of port names, and flags ( 
– function is not supported, 
– supported ). The left half contains tools to configure the first port of a pair highlighted in the tree; the right half, to configure the second port:
and 
– single-line text editors of port names. To set the default port name, you may type "-". If a name is red, a port is already used (and you have to set other name).
Editor of rails:
The editor displays a scheme of "solder-up" of a virtual null-modem cable that connects virtual ports of a pair highlighted in the tree. The following operations are available in the editor:
Dragging a contact to other contact – linking (displayed as a line). One green contact can be linked with one red contact. One red contact can be linked with several green contacts.
Double click over a contact – change inversion ( 
– not inverted, 
– inverted).
The button 
– create a pair (analog of the command install - -)
The button 
– remove the pair highlighted
The button 
– cancel changes made in the utility after the last execution of the command Apply. Current changes are marked in blue.
The button 
– apply changes made.