Yes it is possible but only with utils like runas.exe. Usernames and pwd's are stored as plain text so everyone can read them and (ab)use these credentials so it's very unsafe and imho should always be avoided.

Code:

C:\Program Files\Support Tools>runas /?
RUNAS USAGE:

RUNAS [ [/noprofile | /profile] [/env] [/netonly] ]
        /user: program

RUNAS [ [/noprofile | /profile] [/env] [/netonly] ]
        /smartcard [/user:] program

   /noprofile        specifies that the user's profile should not be loaded.
                     This causes the application to load more quickly, but
                     can cause some applications to malfunction.
   /profile          specifies that the user's profile should be loaded.
                     This is the default.
   /env              to use current environment instead of user's.
   /netonly          use if the credentials specified are for remote
                     access only.
   /savecred         to use credentials previously saved by the user.
                     This option is not available on Windows XP Home Edition
                     and will be ignored.
   /smartcard        use if the credentials are to be supplied from a
                     smartcard.
   /user              should be in form USER@DOMAIN or DOMAIN\USER
   program         command line for EXE.  See below for examples

Examples:
> runas /noprofile /user:mymachine\administrator cmd
> runas /profile /env /user:mydomain\admin "mmc %windir%\system32\dsa.msc"
> runas /env /user:user@domain.microsoft.com "notepad \"my file.txt\""

NOTE:  Enter user's password only when prompted.
NOTE:  USER@DOMAIN is not compatible with /netonly.
NOTE:  /profile is not compatible with /netonly.
_________________________
Mart

- Chuck Norris once sold ebay to ebay on ebay.