Main Help → GENerel Commmands → Use Command
The Use command will transfer control of the current template to a new template; when the new template is done, it will return to the current template:
Use #1,<#2>,<#3>,...
where
#use (for #2), #use1 (for #3), #use2 (for #4), etc.. The variable #usennum will be loaded with the total number of optional parameters that were passed to the new template.use call with Show or ShowAll commands to access data in the file.