OCM modules can import functions from salwrap.dll. This is the list of functions, annotated with hex offset into the function table. The codeblock parser currently makes names with decimal offsets into this table. Readers, beware.
Remote in a function name means that the first parameter is a VM context structure, so that the function could perform work for a different VM than the currently running one, whereas Local means that the current thread ID gets matched to the VM contexts to find out which thread is running. Usually, the Remote functions are used to optimize (passing in the VM context instead of having to look it up) instead of operating on remote or offline VMs. Import 84hex (or 132dec, GetThreadBlock) returns the Local VM structure pointer.
This list is not a comprehensive documentation, I know, but it's a start.
; 00 BuiltinFunctions dd offset RemoteVMAllocateVolatile dd offset RemoteVMFreeVolatile dd offset LocalVMAllocateVolatile dd offset LocalVMFreeVolatile ; 10 dd offset GetModuleNameByHandle dd offset GetModHndByName dd offset GetModuleByHandleEx dd offset AllocCreateModuleEntry ; 20 dd offset LoadNativeModule dd offset sub_651216C0 dd offset InitModule dd offset PrepareModule ; 30 dd offset CreateNamedModule dd offset GetML_C04 dd offset VMThrowError dd offset logstuff ; 40 dd offset gettimeofday dd offset malloc_0 dd offset free dd offset realloc ; 50 dd offset localtime dd offset mktime dd offset atof dd offset CoCreateInstance ; 60 dd offset gmtime dd offset time dd offset sub_6511CFC0 dd offset CoTaskMemAlloc ; 70 dd offset CoTaskMemFree dd offset RelocateModule dd 0 dd offset AdvanceML_C08 ; 80 dd offset GetGlobalByName dd offset GetThreadBlock dd offset sub_6511D070 dd offset EnterCritSectN ; 90 dd offset LeaveCritSectN dd offset sub_65121F30 dd offset sub_65122030 dd 0 ; A0 dd 0 dd offset pow dd offset floor dd offset cos ; B0 dd offset sin dd offset sqrt dd offset atan dd offset log10 ; C0 dd offset fabs dd offset ceil dd offset log dd offset atan2 ; D0 dd offset abs dd offset labs dd 0 dd 0 ; E0 dd 0 dd 0 dd 0 dd offset asin ; F0 dd 0 dd 0 dd 0 dd offset _setjmp ; 100 dd offset sub_651220B0 dd 0 dd 0