The reason is because during the installation of Windows XP Home, the workgroup setting is not saved. However, the workgroup setting is saved after the installation is complete with Windows XP Pro.
The defaults are as follows:
To correct this error, have both Windows XP Home and XP Pro a member of the same workgroup.
You can do that by running the network wizard on each system and entering the proper information. I do not recommend using either of the default workgroups, however.
You should then be able to see each system from the other.
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Windows Service Configurations!
Includes explanations of each service and advice on which services you can safely disable!