Howewer when you run next code under Win98 you get another result:

    int Cnt [100],
         Cnt0 = GetTickCount();
    for (int i=0; i<100; i++)
    {
        Sleep(10);
        Cnt[i] = GetTickCount()-Cnt0;
    }

Here is a typical Cnt[] content:
15, 30 , 40, 51, 65, 81, 96, 106, 120, 130, 140, 151, 165, 180, 190, 205
......
1105,1120,1135,1145,1155,1165,1180,1190,1200,1210,1221,1235

It seems like system timer resolution of Windows 98 is about 5-10 msec.
Where can I read about real Windows 95/98 system timer interval (not about
RTOS in common, Ventur Com RTX,etc :).

Hi

I quote from "Developing Windows NT Drivers". I hope Joe Newcomer and Ed
Dekker don't mind.

"The default interval depends upon the processor and the HAL (Hardware
Abstraction Layer). Typical values are 10mS for a standard x86 uniprocessor
system, 15mS for dual processor x86 system and 7.5mS for an Alpha system"

A way to alter the the system timer is to use the functions timeGetDevCaps()
wich will return the system maximum and minimum values acceptable to the
system. You can then use timeBeginPeriod() to set the required timer
resolution.

If you would like to have acurate timing you will have to use the multimedia
timers.
timeSetEvent(), timeKillEvent are used to create and destroy timers.

HTH

Chris M