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This Stack Overflow question suggests a command which looks as if it should work, but it doesn't (that answer is deleted now, though):
Single line command for Run as a different user on Window 7 that contains a password also
The command would be:
echo PaSsWoRd | runas /user:Administrator cmd
However it says:
unknown user name or bad password.
The details are definitely correct though. For example, if I was to run:
runas /user:Administrator
...and on the next line, if I typed in PaSsWoRd, it would work no problem.