Alternatives for "net send" command

[Peter2]

I use the DOS(?) command "net send" inside our company network to send small messages. Is there an recommended (!) alternative for this feature?

I found Intrasend http://littich.gmxhome.de/IntraSend/main.htm
and hundreds of communication-prjects at sourceforge.net

Who can recommend a
- free
- small
- stable
- clean
- receiver independend tool
- with GUI and command-line-features?

Regards

Peter

[Peter2]

No ideas?

Regards

Peter