|First of all I would highly suggest you use a secure protocol such as SSHv2 instead of telnet.|
Telnet can be scripted in two ways that I am aware of. One way is to use VBScript SendKeys and the other and more preferred way is to use Expect. For your second requirement, you could probably use a simple VBScript and use SendKeys to send ALT+PrintScreen but that would require further code to paste it into mspaint, then hit CTRL+S, etc. You should probably find a command line screen capture utility.