command> install portname=com10 portname=com11

DIALOG: {
The port name COM10 is already used for other device \Device\com0com21.
} ... CANCEL

Install not completed!
command> list
       CNCA0 PortName=-
       CNCB0 PortName=-
       CNCA1 PortName=COM#,RealPortName=COM11
       CNCB1 PortName=COM#,RealPortName=COM10
command> change cnca1 portname=com11
       CNCA0 PortName=-
       CNCB0 PortName=-
       CNCA1 PortName=COM#,RealPortName=COM11
change CNCA1 PortName=COM11
Changed port class for CNCA1 (renamed COM# to COM11)
Disabled CNCA1 com0com\port \Device\com0com11
Removed CNCA1 com0com\port \Device\com0com11
       CNCB1 PortName=COM#,RealPortName=COM10
ComDB: COM11 - logged as "in use"
command> change cncb1 portname=com10
       CNCA0 PortName=-
       CNCB0 PortName=-
       CNCA1 PortName=COM11
       CNCB1 PortName=COM#,RealPortName=COM10
change CNCB1 PortName=COM10
Changed port class for CNCB1 (renamed COM# to COM10)
Disabled CNCB1 com0com\port \Device\com0com21
Removed CNCB1 com0com\port \Device\com0com21
ComDB: COM10 - logged as "in use"
command>