There is a line in "_SNMsynth.cmd" that I do not understand. Can anyone help me? It is line 14: IF DEFINED SWITCH1 IF /I "!SWITCH1:~1!"=="echo" (@ECHO ON) ELSE ECHO ERROR: %1 is not a supported switch.&GOTO :PREEOF What do the exclamation marks and the ":~1" in "!SWITCH1:~1!" do? Also; does anyone know of a good, free, definitive, downloadable guide to the Command shell? I found one: http://www.robvanderwoude.com/