Find the first process (highest priority) with matching name. Process names are compared by
Return the process of the stack-group.
Return the first process that has process-designator as its function (that is, the third argument of process-run-function).
First search for a process using the symbol name as a string, and (if that fails) then search using the symbol as a function.
Find a process for which
is its unique id. The unique id of the current process can be found by