what is the use of Visual admin or using visualadmin what tasks you performed

Visual admin:

It is a Dynamic tool 

using visual admin we can install license 

We can start & stop services 

we can stop & start applications ( Not application servers)

we can access visual admin remotely

We can create the users 

We can monitor logon user sessions

We can connect jco connections 

we can export & import the certificates (EX : sso certificates )   

we can deploy services like ear,.rar files 

We can alsp access the offline config-tool editor 

we need to user name & pwd required to logon to visual admin 

P4 port is used to login to visual admin 

Path: usr/sap/sid/DVEBMGS<SNO>/J2ee /admin/go.bat