The scenario is,

I need to login into the desktop application by entering credentials, perform the business operation steps, logout from the application and then again call the login task created and login into the same desktop application with different user and perform same steps. I need to perform this activity for multiple organizations. Credential vault is used to store the credentials and getting values from there. 

I have created a separate login task activity but have done for one organization. What steps can we do to perform login for multiple organization's? Please help.