The syntax of this command is:

CMDKEY [{/add | /generic}:targetname {/smartcard | /user:username {/pass{:passwo
rd}}} | /delete{:targetname | /ras} | /list{:targetname}]

Examples:

To list available credentials:
cmdkey /list
cmdkey /list:targetname

To create domain credentials:
cmdkey /add:targetname /user:username /pass:password
cmdkey /add:targetname /user:username /pass
cmdkey /add:targetname /user:username
cmdkey /add:targetname /smartcard

To create generic credentials:
The /add switch may be replaced by /generic to create generic credentials

To delete existing credentials:
cmdkey /delete:targetname

To delete RAS credentials:
cmdkey /delete /ras