diff --git a/client/drivers/a2input.s b/client/drivers/a2input.s
index 5ccdcae..030f1b1 100644
--- a/client/drivers/a2input.s
+++ b/client/drivers/a2input.s
@@ -1,8 +1,22 @@
 .export get_key  
-
+.export check_for_abort_key
 .code
 ;use Apple 2 monitor ROM function to read from keyboard
 ;inputs: none
 ;outputs: A contains ASCII code of key pressed
 get_key:
-  jmp $fd1b
\ No newline at end of file
+  jmp $fd1b
+  
+  
+;check whether the escape key is being pressed
+;inputs: none
+;outputs: sec if escape pressed, clear otherwise
+check_for_abort_key:
+lda $c000 ;current key pressed
+cmp #$9B
+bne :+
+sec
+rts
+:
+clc
+rts
diff --git a/client/drivers/c64inputs.s b/client/drivers/c64inputs.s
index e24eb6a..4a864e0 100644
--- a/client/drivers/c64inputs.s
+++ b/client/drivers/c64inputs.s
@@ -3,6 +3,8 @@
 .export filter_text
 .export filter_ip
 .export filter_dns
+.export check_for_abort_key
+
 .importzp copy_src
 
 .include "../inc/common.i"
@@ -18,6 +20,18 @@ get_key:
   beq get_key
   rts
 
+;check whether the RUN/STOP key is being pressed
+;inputs: none
+;outputs: sec if RUN/STOP pressed, clear otherwise
+check_for_abort_key:
+lda $cb ;current key pressed
+cmp #$3F
+bne :+
+sec
+rts
+:
+clc
+rts
 
 ;cribbed from http://codebase64.org/doku.php?id=base:robust_string_input
 ;======================================================================
diff --git a/client/inc/nb65_constants.i b/client/inc/nb65_constants.i
index f5c372c..b87b924 100644
--- a/client/inc/nb65_constants.i
+++ b/client/inc/nb65_constants.i
@@ -80,5 +80,6 @@ NB65_ERROR_TRANSMIT_FAILED                EQU $82
 NB65_ERROR_TRANSMISSION_REJECTED_BY_PEER  EQU $83
 NB65_ERROR_INPUT_TOO_LARGE                EQU $84
 NB65_ERROR_DEVICE_FAILURE                 EQU $85
+NB65_ERROR_ABORTED_BY_USER                EQU $86
 NB65_ERROR_OPTION_NOT_SUPPORTED           EQU $FE
 NB65_ERROR_FUNCTION_NOT_SUPPORTED         EQU $FF
diff --git a/client/ip65/dhcp.s b/client/ip65/dhcp.s
index b7887ae..a20c31c 100644
--- a/client/ip65/dhcp.s
+++ b/client/ip65/dhcp.s
@@ -46,7 +46,7 @@ MAX_DHCP_MESSAGES_SENT=12     ;timeout after sending 12 messages will be about 1
 	.import udp_send_src_port
 	.import udp_send_dest_port
 	.import udp_send_len
-
+  .import check_for_abort_key
   .import timer_read
   
 	.bss
@@ -157,6 +157,12 @@ dhcp_init:
 
 @inner_delay_loop:  
   jsr ip65_process
+  jsr check_for_abort_key
+  bcc @no_abort
+  lda #NB65_ERROR_ABORTED_BY_USER
+  sta ip65_error
+  rts
+@no_abort:  
   lda #0
   cmp dhcp_break_polling_loop
   bne @break_polling_loop
diff --git a/client/ip65/dns.s b/client/ip65/dns.s
index a231877..7d22a74 100644
--- a/client/ip65/dns.s
+++ b/client/ip65/dns.s
@@ -34,7 +34,7 @@
 	.import udp_send_src_port
 	.import udp_send_dest_port
 	.import udp_send_len
-
+  .import check_for_abort_key
   .import timer_read
   
 	.segment "IP65ZP" : zeropage
@@ -219,6 +219,13 @@ dns_resolve:
   
 @inner_delay_loop:  
   jsr ip65_process
+  jsr check_for_abort_key
+  bcc @no_abort
+  lda #NB65_ERROR_ABORTED_BY_USER
+  sta ip65_error
+  rts
+@no_abort:  
+  
   lda dns_state
   cmp #dns_complete
   beq @complete
diff --git a/client/nb65/nb65_c64.s b/client/nb65/nb65_c64.s
index 08a700e..bf92373 100644
--- a/client/nb65/nb65_c64.s
+++ b/client/nb65/nb65_c64.s
@@ -182,7 +182,6 @@ main_menu:
   cmp #KEYCODE_F7
   beq @change_config
   
-  jsr print_hex
   jmp @get_key
 
 @exit_to_basic:
diff --git a/doc/nb65_api_technical_reference.doc b/doc/nb65_api_technical_reference.doc
index 06b739a..695f8bf 100644
Binary files a/doc/nb65_api_technical_reference.doc and b/doc/nb65_api_technical_reference.doc differ