XP Home running Remote Desktop Client?

Absolutely not. You just need to install a version of RDC or terminal services on your computer. From Microsoft's website:

The Remote Desktop Connection software is pre-installed with Windows XP. To run it, click Start, click All Programs, click Accessories, click Communications, and then click Remote Desktop Connection. This software package can also be found on the Windows XP Professional and Windows XP Home Edition product CDs and can be installed on any supported Windows platform. To install from the CD, insert the disc into the target machine's CD-ROM drive, select Perform Additional Tasks, and then click Install Remote Desktop Connection.

As long as both machines are running the same remote access software and the files are compatable, then there is no reason that it wont work. You can even fileshare from a WIN98 machine to an XP machine. Just as long as you have the software to run the file.

Yes, WinXP Home can access WinXP Pro using Remote Desktop Client. You can also download a Remote Desktop Client for Win9x and Win2K from Microsoft web site which would allow you to access the WinXP on computing running other versions of Windows.

If it is true that you can access a Windows XP Pro machine from a Windows XP Home machine, what could be wrong if you encounter an error? I have tried it many times on my home network and it doesn't seem to work. Every time that I try it, it givesme an error. Any ideas?