1.Host a game with a second client
2.Add Hit Eventhandler on both of you
player addEventHandler ["Hit", {systemchat (str ["Hit",servertime,diag_frameNo]);}];
3.Add Fired Eventhandler on both of you
player addEventHandler ["Fired", {
params ["_player", "_weapon", "_muzzle", "_mode", "_ammo", "_magazine", "_projectile", "_gunner"];
//Putting Eventhandler on your grenade
_projectile addEventHandler ["Explode", {systemchat str ["Explode Client Grenade",[servertime,diag_frameNo]];}];
//Putting Eventhandler on your second client so he triggers the explosion as well
[_projectile,{ _this addEventHandler ["Explode", {systemchat str ["Explode Global Grenade",[servertime,diag_frameNo]];}];}]remoteExecCall ["call", 0];
}];
4. Throw a grenade yourself and let the second client throw one. Make sure to get hit by both of them, so you can compare