What if you wanna make beams trackable in not-ECX? so here you are 
[php]
stock setWeaponHoming( Weapon, Velocity, Float: DetectableRange )
{
new Target, Float: Range[33];
for( new i = 1; i <= 32; i++ )// Save the range between the client and the beam if the client is in the detectable range
{
if( is_user_connected( i ) )
{
if( is_user_alive( i ) && i != pev( Weapon, pev_owner ) )
{
if( entity_range( Weapon, i ) <= DetectableRange )
{
Range[i] = entity_range( Weapon, i );
Target = i;
}
}
}
}
for( new n = 1; n <= 32; n++ )// Get the index of the client who is nearest the beam
{
if( Range[n] < Range[Target] && Range[n] != 0.0 )
{
Target = n;
}
}
new CORE[3];
CORE[0] = Weapon;
CORE[1] = Target;
CORE[2] = Velocity;
set_task( 0.1, "WeaponTrackThink", Weapon, CORE, 3, "b" )// Refresh the vector of the beam to the client every 0.1s
}
public WeaponTrackThink( CORE )
{
new Weapon = CORE[0];
new Target = CORE[1];
new Velocity = CORE[2];
if( Target != 0 && is_user_alive( Target ) )
{
/* Get the origins of the beam and the target */
new Float: vec[3], Float: WeaponOrg[3], Float: TargetOrg[3];
pev( Weapon, pev_origin, WeaponOrg );
pev( Target, pev_origin, TargetOrg );
/* Compute velocity by origins */
vec[0] = TargetOrg[0] - WeaponOrg[0];
vec[1] = TargetOrg[1] - WeaponOrg[1];
vec[2] = TargetOrg[2] - WeaponOrg[2];
xs_vec_normalize( vec, vec );
/* Update the angles of the entity */
new Float: ang[3];
vector_to_angle( vec, ang );
set_pev( Weapon, pev_angles, ang );
/* Give velocity to the beam */
xs_vec_mul_scalar(vec, float( Velocity ), vec);
set_pev( Weapon, pev_velocity, vec );
}
}
[/php]