//UI:
lua_State *fromLs;
vmCvar_t fromCv;
trap_Cvar_Register(&fromCv,"uiToCgame","0",CVAR_INTERNAL);
/* *fromLs = getData(); */
trap_Cvar_Set("uiToCgame",va("%d",fromLs));

//CGAME:
char buf[128];
lua_State *toLs;
memset(buf, 0, sizeof(buf));
trap_Cvar_VariableStringBuffer("uiToCgame",buf,sizeof(buf));
toLs = atoi(buf);