Remote Access solution

[Haymi Rock <haymirock () googlemail com>]

Hello everyone,

I started working as a technical customer support for a company who
has a lot of customers in the whole world. They are using PCAnywhere
for remote access, but sometimes it doesn't work.

My question is about what is the most reliable, secure software that
can support as well "Access Invitations" (Such as Microsoft's Remote
Assistant)?
What do big organizations use for remote access or remote management?

Your help is so much appreciated.
Best regards,

Simon