Client Schedule ID’s

Hardware Inventory Collection Task

{00000000-0000-0000-0000-000000000001}

Software Inventory Collection Task

{00000000-0000-0000-0000-000000000002}

Heartbeat Discovery Cycle

{00000000-0000-0000-0000-000000000003}

Software Inventory File Collection Task

{00000000-0000-0000-0000-000000000010}

Request Machine Policy Assignments

{00000000-0000-0000-0000-000000000021}

Evaluate Machine Policy Assignments

{00000000-0000-0000-0000-000000000022}

Refresh Default MP Task

{00000000-0000-0000-0000-000000000023}

Refresh Location Services Task

{00000000-0000-0000-0000-000000000024}

Location Services Cleanup Task

{00000000-0000-0000-0000-000000000025}

Software Metering Report Cycle

{00000000-0000-0000-0000-000000000031}

Source Update Manage Update Cycle

{00000000-0000-0000-0000-000000000032}

Policy Agent Cleanup Cycle

{00000000-0000-0000-0000-000000000040}

Request Machine Policy Assignments

{00000000-0000-0000-0000-000000000042}

Certificate Maintenance Cycle

{00000000-0000-0000-0000-000000000051}

Peer Distribution Point Status Task

{00000000-0000-0000-0000-000000000061}

Peer Distribution Point Provisioning Status Task

{00000000-0000-0000-0000-000000000062}

Compliance Interval Enforcement

{00000000-0000-0000-0000-000000000071}

Software Updates Agent Assignment Evaluation Cycle

{00000000-0000-0000-0000-000000000108}

Send Unsent State Messages

{00000000-0000-0000-0000-000000000111}

State Message Manager Task

{00000000-0000-0000-0000-000000000112}

Force Update Scan

{00000000-0000-0000-0000-000000000113}

AMT Provision Cycle

{00000000-0000-0000-0000-000000000120}

You can use the above codes to kick off different events on the client.  There are several scripts out there that will allow you to to do this.  One of the most used is the SendSched.vbs file from the SMS 2003 Toolkit2.  The toolkit can be downloaded from this link.