Allow local user control in RDP?

StateGuy

TS Rookie
In our network we have many remote sites. We are currently all WinXP Pro but are starting to transition to Windows 7 (64-bit) when we cycle PCs out.

We have been using RealVNC for years instead of RDP because RealVNC allows shared control of the PC between you and the local user (ie: "Show me what you are talking about"). I've tried Tight (which leaves lots remnants after uninstalling), Real (simply does not work unless you buy the Enterprise version, for ~800 computers that just isn't going to work) and Ultra (works, but randomly resets its options and closes down once you log out of a profile).

Is there a way to allow shared control during RDP? If not, is there another VNC-ish program I can try (freeware) that's as reliable as RealVNC has been under XP?