Introduction - If you have any usage issues, please Google them yourself
In the next example, TEX would process the /mycat/mypgm file searching for the !hello2 label(*). TEX would continue processing until an exit statement or end of file was reached. An error would be thrown if a return statement was d and there were no CALLs active.
(*) TEX did not check for duplicate labels in the same file, consequently execution was unpredictable if present.