Summary:
I'm trying to automate a process. 
In the process I create sql credentials and a windows account.
At a point in the process I have to execute code as that windows account.  For example: create asymmetric key.
Then after that windows user creates the asymmetric key I have to complete some additional tasks to complete the automation.

So in a nutshell:
Execute code as me.
Execute code as a different Windows user.
Execute code as me.
Done.