suse + winxp + slackware as second distro

I already have installed in my computer SuSE and WinXP. It's a dual-booting computer. I want to know if installing slackware in another partition could affect the other two systems. Also I wonder whether I should use the same swap partition or it should be better have two swap partition for two distro. Will slackware create a menu as SuSE had done: choice OS to start, Linux, Windows, Memory Test, etc.? How could I include Slackware as a option to SuSE starting up menu to permit choosing Linux, Windows, Memory Test *AND* Slackware? thanks for any help a. PS-I don't know how slackware works. I just want to try another distro this time.