Logging into a linux box using a different id [migrated]

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http://stackoverflow.com – I have a basic question,am logging to a linux box using securecrt with my username and password,it has my username and password saved,i want to login using a different username to the same linux box,how do I do that?since I am already logging and the data is saved,everytime I login its automatically logging with current credentials (HowTos)