What library on MIAVX1 is the c sleep() function located in? I've already included what I believe to be the correct header. How do I include the library? How do I find this information out for myself? The error is included below, perhaps I dont need a library but something else? thanks, ralph What is thy bidding?>link loader.obj %LINK-W-NUDFSYMS, 1 undefined symbol: %LINK-I-UDFSYM, SLEEP %LINK-W-USEUNDEF, undefined symbol SLEEP referenced in psect $LINK$ offset %X00000040 in module LOADER file SYS_USERS:[SAN.GOODPARC.HOLE]LOADER.OBJ;4