The command is quite simple, for example:
There is one parameter – the name of the file containing the image. It may be of type .jpg, .png or .bmp. If the file name is not an absolute path, and is not qualified by a configured helper folder alias, then the file will be assumed to be in the same folder as the template which was run.
Each template which is to have a logo on the interview must contain the InterviewLogo command. This means, for instance, that each template can have a unique logo. However, if you use the IncludeCodeTemplate approach as described in Best Practices for Advanced Authors: Part II – The Interview, then the InterviewLogo command can be placed in the code template, and then will apply to all templates that include that code template.