Missing shring files

Experimenting to make network between two computers with crossed cables.

Both with Win XP PRO +SP2 and similar setup.

I can see that both computers find each other on My Network Places.

From computer "A" I find and full manage computer "B" by Remote Desktop
Connection,
but from computer "B" I'm not able to connect to "A" by Remote Desktop
Connection.

From My Network Places on "B" I can browse through My Documents directories
on "A" , but only some files are not detected when I compare the directory
content reading
directly from "A" computer

On both computers I'm the admin. The only difference are the computers name.
User names are the same too (admin. name).

Jan