an example can be found on AMOSPro_Tutorial:Tutorials/Procedures_1.AMOS
Marks the END of a PROCedure. Like PROCEDURE, it must occupy its own separate line in your program.
Procedure NAME : : : Amos instructions go here End Proc
You can also return a value from the procedure like so:
Endproc[number] Endproc[real#] Endproc[s$]
These values can be subsequently read by your program with PARAM, PARAM#, and PARAM$ respectively.