How to know if the palm is powering on or is going to sleep

Register for some notification and handle them as followsUnregister with SysNotifyUnregister() when no more neededYou can use a Feature (see How to store a permanent value... ) to store the program start time

/*********************************************************************************************/
static void RegisterForNotifications()
{
UInt16 cardNo=0;
UInt32 romVersion=0;
LocalID dbID=0;
FtrGet(sysFtrCreator, sysFtrNumROMVersion, &romVersion);
if(romVersion <>
return;
if(SysCurAppDatabase(&cardNo, &dbID)!=0)
return;
// Register the Notification you need
SysNotifyRegister(cardNo, dbID, sysNotifyEarlyWakeupEvent, NULL, sysNotifyNormalPriority, 0);
SysNotifyRegister(cardNo, dbID, sysNotifyLateWakeupEvent, NULL, sysNotifyNormalPriority, 0);
SysNotifyRegister(cardNo, dbID, sysNotifySleepRequestEvent, NULL, sysNotifyNormalPriority, 0);
}
/****************************************************************************************/
static void HandleNotifications(SysNotifyParamType *np)
{
if(np->notifyType==sysNotifyEarlyWakeupEvent)
{
// Do something
}
else if(np->notifyType==sysNotifyLateWakeupEvent)
{
// Do something
}
else if(np->notifyType==sysNotifySleepRequestEvent)
{
// Do something
}
}

/***************************************************************************************/
UInt32 PilotMain(UInt16 cmd,void *cmdPBP,UInt16 launchFlags)
{
switch(cmd)
{
case sysAppLaunchCmdSystemReset:
case sysAppLaunchCmdSyncNotify:
RegisterForNotifications();
break;
case sysAppLaunchCmdNotify:
case sysNotifySleepRequestEvent:
HandleNotifications((SysNotifyParamType *)cmdPBP);
break;
case sysAppLaunchCmdNormalLaunch:
... Normal code ...

}