How can I send windows command from CA DevTest to a remote windows machine?
You could use an external command step, but you would need access to the remote Windows machine from the Windows machine you are executing DevTest from. Map as a share drive to access.
Execute External Command - DevTest Solutions - 10.1 - CA Technologies Documentation
You might consider a custom SSH step. Review these links:
SSH and SFTP step for 8.0.1
Run Shell script from Unix box
Can i login to linux servers using LISA
Can we connect to putty from lisa
or look to see if the Execute External Command would help you.